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2d42d3ba44
SDM845's Adreno SMMU is unique in that it actually advertizes support for 16K (and 32M) pages, which doesn't hold for newer SoCs. This however, seems either broken in the hardware implementation, the hypervisor middleware that abstracts the SMMU, or there's a bug in the Linux kernel somewhere down the line that nobody managed to track down. Booting SDM845 with 16K page sizes and drm/msm results in: *** gpu fault: ttbr0=0000000000000000 iova=000100000000c000 dir=READ type=TRANSLATION source=CP (0,0,0,0) right after loading the firmware. The GPU then starts spitting out illegal intstruction errors, as it's quite obvious that it got a bogus pointer. Moreover, it seems like this issue also concerns other implementations of SMMUv2 on Qualcomm SoCs, such as the one on SC7180. Hide 16K support on such instances to work around this. Reported-by: Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20240824-topic-845_gpu_smmu-v2-1-a302b8acc052@quicinc.com Signed-off-by: Will Deacon <will@kernel.org> |
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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 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.