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AMD IOMMU hardware supports PCI Peripheral Paging Request (PPR) using a PPR log, which is a circular buffer containing requests from downstream end-point devices. There is one PPR log per IOMMU instance. Therefore, allocate an iopf_queue per IOMMU instance during driver initialization, and free the queue during driver deinitialization. Also rename enable_iommus_v2() -> enable_iommus_ppr() to reflect its usage. And add amd_iommu_gt_ppr_supported() check before enabling PPR log. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Co-developed-by: Vasant Hegde <vasant.hegde@amd.com> Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20240418103400.6229-10-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 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.