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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.
Harini Katakam
authored
GEM version in ZynqMP and most versions greater than r1p07 supports TX and RX BD prefetch. The number of BDs that can be prefetched is a HW configurable parameter. For ZynqMP, this parameter is 4. When GEM DMA is accessing the last BD in the ring, even before the BD is processed and the WRAP bit is noticed, it will have prefetched BDs outside the BD ring. These will not be processed but it is necessary to have accessible memory after the last BD. Especially in cases where SMMU is used, memory locations immediately after the last BD may not have translation tables triggering HRESP errors. Hence always allocate extra BDs to accommodate for prefetch. The value of tx/rx bd prefetch for any given SoC version is: 2 ^ (corresponding field in design config 10 register). (value of this field >= 1) Added a capability flag so that older IP versions that do not have DCFG10 or this prefetch capability are not affected. Signed-off-by:Harini Katakam <harini.katakam@xilinx.com> Reviewed-by:
Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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