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When running the RK3588 in Endpoint mode, with an Intel host with IOMMU enabled, the host side prints: DMAR: VT-d detected Invalidation Time-out Error: SID 0 When running the RK3588 in Endpoint mode, with an AMD host with IOMMU enabled, the host side prints: iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=63:00.0 address=0x42b5b01a0] Rockchip has confirmed that the ATS support for RK3588 only works when running the PCIe controller in Root Complex (RC) mode, see: https://lore.kernel.org/linux-pci/93cdce39-1ae6-4939-a3fc-db10be7564e5@rock-chips.com Usually, to handle these issues, we add a quirk for the PCI vendor and device ID in drivers/pci/quirks.c with quirk_no_ats(). That is because we cannot usually modify the capabilities on the EP side. In this case, we can modify the capabilities on the EP side. Thus, hide the broken ATS capability on RK3588 when running in EP mode. That way, we don't need any quirk on the host side, and we see no errors on the host side, and we can run pci_endpoint_test successfully, with the IOMMU enabled on the host side. Acked-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Niklas Cassel <cassel@kernel.org> [kwilczynski: commit log, tidy up code comments and error message] Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/20250310094826.842681-6-cassel@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 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.