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Each IOMMU has three log buffers (Event, GA and PPR log). Once a buffer becomes full, IOMMU generates an interrupt with the corresponding overflow status bit, and stop processing the log. To handle an overflow, the IOMMU driver needs to disable the log, clear the overflow status bit, and re-enable the log. This procedure is same among all types of log buffer except it uses different overflow status bit and enabling bit. Hence, to consolidate the log buffer restarting logic, introduce a helper function amd_iommu_restart_log(), which caller can specify parameters specific for each type of log buffer. Also rename MMIO_STATUS_EVT_OVERFLOW_INT_MASK as MMIO_STATUS_EVT_OVERFLOW_MASK. Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Reviewed-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Link: https://lore.kernel.org/r/20230628051624.5792-2-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.