fcf226f1f7
As specified in this driver, the context banks are 0x1000 apart but on some SoCs the context number does not necessarily match this logic, hence we end up using the wrong ASID: keeping in mind that this IOMMU implementation relies heavily on SCM (TZ) calls, it is mandatory that we communicate the right context number. Since this is all about how context banks are mapped in firmware, which may be board dependent (as a different firmware version may eventually change the expected context bank numbers), introduce a new property "qcom,ctx-asid": when found, the ASID will be forced as read from the devicetree. When "qcom,ctx-asid" is not found, this driver retains the previous behavior as to avoid breaking older devicetrees or systems that do not require forcing ASID numbers. Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> [Marijn: Rebased over next-20221111] Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20230622092742.74819-3-angelogioacchino.delregno@collabora.com Signed-off-by: Will Deacon <will@kernel.org>
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.