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Based on research and ideas by Alexandre and Christian. VCE1 actually executes its code from the VCPU BO. Due to various hardware limitations, the VCE1 requires the VCPU BO to be in the low 32 bit address range. However, VRAM is typically mapped at the high address range, which means the VCPU can't access VRAM through the FB aperture. To solve this, we write a few page table entries to map the VCPU BO in the GART address range. And we make sure that the GART is located at the low address range. That way the VCE1 can access the VCPU BO. v2: - Adjust to v2 of the GART helper commit. - Add empty line to multi-line comment. v3: - Instead of relying on gmc_v6 to set the GART space before GTT, add a new function amdgpu_vce_required_gart_pages() which is called from amdgpu_gtt_mgr_init() directly. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Co-developed-by: Alexandre Demers <alexandre.f.demers@gmail.com> Signed-off-by: Alexandre Demers <alexandre.f.demers@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.