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Due to a watchdog timer in the LBW path, writes to the MSI-X doorbell can return sporadic error responses. To work-around this issue, a virtual MSI-X doorbell on the HBW path is configured, using the MSI-X AXI slave interface in the PCIe controller. Upon an access to a configured HBW host address, the controller will generate MSI-X interrupt instead of treating the access as regular host memory access. This patch allocates the dedicate host memory page, and communicate the address to F/W, so it will configure the relevant address match registers in the controller, and will use this address to generate MSI-X interrupts for F/W events. Following patches will handle other initiators in the device, to move them to use the virtual MSI-X doorbell. Signed-off-by: Tomer Tayar <ttayar@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.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.