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The current code using NV90F1_CTRL_CMD_VASPACE_COPY_SERVER_RESERVED_PDES not only requires changes to support the new page table layout used on Hopper/Blackwell GPUs, but is also broken in that it always mirrors the PDEs used for virtual address 0, rather than the area reserved for RM. This works fine for the non-NVK case where the kernel has full control of the VMM layout and things end up in the right place, but NVK puts its kernel reserved area much higher in the address space. Fixing the code to work at any VA is not enough as some parts of RM want the reserved area in a specific location, and NVK would then hit other assertions in RM instead. Fortunately, it appears that RM never needs to allocate anything within its reserved area for DRM clients, and the COPY_SERVER_RESERVED_PDES control call primarily serves to allow RM to locate the root page table when initialising a channel's instance block. Flag VMMs allocated by the DRM driver as externally owned, and use NV0080_CTRL_CMD_DMA_SET_PAGE_DIRECTORY to inform RM of the root page table in a similar way to NVIDIA's UVM driver. The COPY_SERVER_RESERVED_PDES paths are kept for the golden context image and gr scrubber channel, where RM needs the reserved area. Signed-off-by: Ben Skeggs <bskeggs@nvidia.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Reviewed-by: Timur Tabi <ttabi@nvidia.com> Tested-by: Timur Tabi <ttabi@nvidia.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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 reStructuredText 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.