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b87b2c4d91
With recent kernels (>5.2), the driver fails to probe, as the allocation of the driver's scatter buffer fails with -ENOMEM. This happens in crypto4xx_build_sdr(). Where the driver tries to get 512KiB (=PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD) of continuous memory. This big chunk is by design, since the driver uses this circumstance in the crypto4xx_copy_pkt_to_dst() to its advantage: "all scatter-buffers are all neatly organized in one big continuous ringbuffer; So scatterwalk_map_and_copy() can be instructed to copy a range of buffers in one go." The PowerPC arch does not have support for DMA_CMA. Hence, this patch reorganizes the order in which the memory allocations are done. Since the driver itself is responsible for some of the issues. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.