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a15b1883fe
So far we only allowed mapping of MMIO BARs to the userspace. However there are GPUs with on-board coherent RAM accessible via side channels which we also want to map to the userspace. The first client for this is NVIDIA V100 GPU with NVLink2 direct links to a POWER9 NPU-enabled CPU; such GPUs have 16GB RAM which is coherently mapped to the system address space, we are going to export these as an extra PCI region. We already support extra PCI regions and this adds support for mapping them to the userspace. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.