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6062acc1b8
The driver should still be functional with small-bar, just that the vram
size is clamped to the BAR size (until we add proper support for tiered
vram). For stolen vram we shouldn't iomap anything if the BAR size
doesn't also contain the stolen portion, since on discrete the stolen
portion is always at the end of normal vram. Stolen should still be
functional, just that allocating CPU visible io memory will always
return an error.
v2 (Lucas)
- Mention in the commit message that stolen vram is always as the end
of normal vram, which is why stolen in not mappable on small-bar
systems.
- Just make xe_ttm_stolen_inaccessible() return true for such cases.
Also rename to xe_ttm_stolen_cpu_inaccessible to better describe
that we are talking about direct CPU access. Plus add some
kernel-doc.
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/209
Reported-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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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.