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On integrated it looks like the GGTT base should always 1:1 maps to
somewhere within DSM. On discrete the base seems to be pre-programmed with
a normal lmem address, and is not 1:1 mapped with the base address. On
such devices probe the lmem address directly from the PTE.
v2(Ville):
- The base is actually the pre-programmed GGTT address, which is then
meant to 1:1 map to somewhere inside dsm. In the case of dgpu the
base looks to just be some offset within lmem, but this also happens
to be the exact dsm start, on dg1. Therefore we should only need to
fudge the physical address, before allocating from stolen.
- Bail if it's not located in dsm.
v3:
- Scratch that. There doesn't seem to be any relationship with the
base and PTE address, on at least DG1. Let's instead just grab the
lmem address from the PTE itself.
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Nirmoy Das <nirmoy.das@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220315181425.576828-7-matthew.auld@intel.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 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.