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In cases where we have an issue in the device interrupt path with IOMMU interrupt remapping enabled, dumping valid IRT table entries for the device is very useful and good input for debugging the issue. eg. -> To dump irte entries for a particular device #echo "c4:00.0" > /sys/kernel/debug/iommu/amd/devid #cat /sys/kernel/debug/iommu/amd/irqtbl | less or #echo "0000:c4:00.0" > /sys/kernel/debug/iommu/amd/devid #cat /sys/kernel/debug/iommu/amd/irqtbl | less Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> Reviewed-by: Vasant Hegde <vasant.hegde@amd.com> Link: https://lore.kernel.org/r/20250702093804.849-8-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.