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Jarkko Nikula
9e23897bca
DMA transfer faults on Intel hardware when the IOMMU is enabled and driver initialization will fail when attempting to do the first transfer: DMAR: DRHD: handling fault status reg 2 DMAR: [DMA Read NO_PASID] Request device [00:11.0] fault addr 0x676e3000 [fault reason 0x71] SM: Present bit in first-level paging entry is clear i3c mipi-i3c-hci.0: ring 0: Transfer Aborted mipi-i3c-hci mipi-i3c-hci.0: probe with driver mipi-i3c-hci failed with error -62 Reason for this is that the IOMMU setup is done for the physical devices only and not for the virtual I3C Controller device object. Therefore use the pointer to a physical device object with the DMA API. Due to a data corruption observation when the device DMA is IOMMU mapped, a properly sized receive bounce buffer is required if transfer length is not a multiple of DWORDs. Reported-by: Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20250822105630.2820009-4-jarkko.nikula@linux.intel.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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.