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Linux kernel source tree
21fc936cae
MediaTek MT8188 SoC has an ARM Mali-G57 MC3 GPU (Valhall-JM), which constantly faults with the current panfrost support. For instance, running `glmark2-es2-drm` benchmark test: ``` [ 79.617461] panfrost 13000000.gpu: js fault, js=1, status=JOB_BUS_FAULT, head=0xaadc380, tail=0xaadc380 [ 80.119811] panfrost 13000000.gpu: gpu sched timeout, js=0, config=0x7300, status=0x58, head=0xaaca180, tail=0xaaca180, sched_job=000000002fd03ccc [ 80.129083] panfrost 13000000.gpu: Unhandled Page fault in AS0 at VA 0x0000000000000000 [ 80.129083] Reason: TODO [ 80.129083] raw fault status: 0x1C2 [ 80.129083] decoded fault status: SLAVE FAULT [ 80.129083] exception type 0xC2: TRANSLATION_FAULT_2 [ 80.129083] access type 0x1: EXECUTE [ 80.129083] source id 0x0 ``` Note that current panfrost mode (Mali LPAE - LEGACY) only allows to specify write-cache or implementation-defined as the caching policy, probably not matching the right configuration. As depicted in the source code: drivers/iommu/io-pgtable-arm.c: ``` * MEMATTR: Mali has no actual notion of a non-cacheable type, so the * best we can do is mimic the out-of-tree driver and hope that the * "implementation-defined caching policy" is good enough... ``` Now that Panfrost supports AARCH64_4K page table format, let's enable it on Mediatek MT8188 and configure the cache/shareability policies properly. Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Signed-off-by: Steven Price <steven.price@arm.com> Link: https://lore.kernel.org/r/20250324185801.168664-6-ariel.dalessandro@collabora.com |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
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| README | ||
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.