3a3181e16f
When a passthrough IO adapter is removed from a pseries machine using hash MMU and the XIVE interrupt mode, the POWER hypervisor expects the guest OS to clear all page table entries related to the adapter. If some are still present, the RTAS call which isolates the PCI slot returns error 9001 "valid outstanding translations" and the removal of the IO adapter fails. This is because when the PHBs are scanned, Linux maps automatically the INTx interrupts in the Linux interrupt number space but these are never removed. To solve this problem, we introduce a PPC platform specific pcibios_remove_bus() routine which clears all interrupt mappings when the bus is removed. This also clears the associated page table entries of the ESB pages when using XIVE. For this purpose, we record the logical interrupt numbers of the mapped interrupt under the PHB structure and let pcibios_remove_bus() do the clean up. Since some PCI adapters, like GPUs, use the "interrupt-map" property to describe interrupt mappings other than the legacy INTx interrupts, we can not restrict the size of the mapping array to PCI_NUM_INTX. The number of interrupt mappings is computed from the "interrupt-map" property and the mapping array is allocated accordingly. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200807101854.844619-1-clg@kaod.org
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.