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IOMMU uses device table data structure to get per-device information for DMA remapping, interrupt remapping, and other functionalities. It's a valuable data structure to visualize for debugging issues related to IOMMU. eg. -> To dump device table entry for a particular device #echo 0000:c4:00.0 > /sys/kernel/debug/iommu/amd/devid #cat /sys/kernel/debug/iommu/amd/devtbl or #echo c4:00.0 > /sys/kernel/debug/iommu/amd/devid #cat /sys/kernel/debug/iommu/amd/devtbl Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> Reviewed-by: Vasant Hegde <vasant.hegde@amd.com> Link: https://lore.kernel.org/r/20250702093804.849-7-dheerajkumar.srivastava@amd.com Signed-off-by: Will Deacon <will@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.