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AMD IOMMU has three log buffers (i.e. Event, PPR, and GA). These logs can be configured to generate different interrupts when an entry is inserted into a log buffer. However, current implementation share single interrupt to handle all three logs. With increasing usages of the GA (for IOMMU AVIC) and PPR logs (for IOMMUv2 APIs and SVA), interrupt sharing could potentially become performance bottleneck. Hence, separate IOMMU interrupt into use three separate vectors and irq threads with corresponding name, which will be displayed in the /proc/interrupts as "AMD-Vi<x>-[Evt/PPR/GA]", where "x" is an IOMMU id. Note that this patch changes interrupt handling only in IOMMU x2apic mode (MMIO 0x18[IntCapXTEn]=1). In legacy mode it will continue to use single MSI interrupt. Signed-off-by: Vasant Hegde<vasant.hegde@amd.com> Reviewed-by: Alexey Kardashevskiy<aik@amd.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Link: https://lore.kernel.org/r/20230628053222.5962-3-vasant.hegde@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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 Restructured Text 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.