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aa6ca5a9d7
DPC supports shared interrupts, but it plays very loosely with testing whether the interrupt is generated by DPC before generating spurious log messages, such as: dpc 0000:10:01.2:pcie010: DPC containment event, status:0x1f00 source:0x0000 Testing the status register for zero or -1 is not sufficient when the device supports the RP PIO First Error Pointer register. Change this to test whether the interrupt is enabled in the control register, retaining the device present test, and that the status reports the interrupt as signaled and DPC is triggered, clearing as a spurious interrupt otherwise. Additionally, since the interrupt is actually serviced by a workqueue, disable the interrupt in the control register until that completes or else we may never see it execute due to further incoming interrupts. A software generated DPC floods the system otherwise. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Bjorn Helgaas <helgaas@kernel.org> Reviewed-by: Keith Busch <keith.busch@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.