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The mmu600_pcie is connected with the five PCIe controllers. The mmu600_php is connected with the USB3 controller, the GMAC controllers, and the SATA controllers. See 8.2 Block Diagram, in rk3588 TRM (Technical Reference Manual). The IOMMUs are disabled by default, as further patches are needed to program the SID/SSIDs in to the IOMMUs. iommu: Default domain type: Translated iommu: DMA domain TLB invalidation policy: strict mode arm-smmu-v3 fc900000.iommu: ias 48-bit, oas 48-bit (features 0x001c1eaf) arm-smmu-v3 fc900000.iommu: allocated 65536 entries for cmdq arm-smmu-v3 fc900000.iommu: allocated 32768 entries for evtq arm-smmu-v3 fc900000.iommu: msi_domain absent - falling back to wired irqs Additionally, the IOMMU correctly triggers an IOMMU fault when a PCIe device performs a write (since the device hasn't been assigned a SID/SSID): arm-smmu-v3 fc900000.iommu: event 0x02 received: arm-smmu-v3 fc900000.iommu: 0x0000010000000002 arm-smmu-v3 fc900000.iommu: 0x0000000000000000 arm-smmu-v3 fc900000.iommu: 0x0000000000000000 arm-smmu-v3 fc900000.iommu: 0x0000000000000000 While this doesn't provide much value as is, having the devices as disabled in the device tree will allow developers to see that the rk3588 actually has IOMMUs on the SoC. Signed-off-by: Niklas Cassel <cassel@kernel.org> Link: https://lore.kernel.org/r/20240502140231.477049-2-cassel@kernel.org Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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.