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9f78e446bd
This patch makes iommu/amd call report_iommu_fault() when an I/O page fault occurs, which has two effects: 1) It allows device drivers to register a callback to be notified of I/O page faults, via the iommu_set_fault_handler() API. 2) It triggers the io_page_fault tracepoint in report_iommu_fault() when an I/O page fault occurs. The latter point is the main aim of this patch, as it allows rasdaemon-like daemons to be notified of I/O page faults, and to possibly initiate corrective action in response. A number of other IOMMU drivers already use report_iommu_fault(), and I/O page faults on those IOMMUs therefore already trigger this tracepoint -- but this isn't yet the case for AMD-Vi and Intel DMAR. The AMD IOMMU specification suggests that the bit in an I/O page fault event log entry that signals whether an I/O page fault was for a read request or for a write request is only meaningful when the faulting access was to a present page, but some testing on a Ryzen 3700X suggests that this bit encodes the correct value even for I/O page faults to non-present pages, and therefore, this patch passes the R/W information up the stack even for I/O page faults to non-present pages. Signed-off-by: Lennert Buytenhek <buytenh@arista.com> Link: https://lore.kernel.org/r/YVLyBW97vZLpOaAp@wantstofly.org Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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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.