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The three DMA memory regions allocated for the host memory space are documented to require alignment of 128, 1024, and 1024 respectively, but the returned address is checked for PAGE_SIZE alignment. In the case where these allocations are serviced by e.g. the Arm SMMU, the size and alignment will be determined by its supported page sizes. In most cases SZ_4K and a few larger sizes are available. In the typical configuration this does not cause problems, but in the event that the system PAGE_SIZE is increased beyond 4k, it's no longer reasonable to expect that the allocation will be PAGE_SIZE aligned. Limit the DMA alignment check to the actual alignment requirements written in the comments in the code, to avoid the UFS core refusing to initialize with such configuration. Link: https://lore.kernel.org/r/20230201034917.1902330-1-quic_bjorande@quicinc.com Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Asutosh Das <quic_asutoshd@quicinc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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 Restructured Text 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.