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2223587df5
Add a driver for the Intel CBDMA device. This driver is based on and named after the Linux driver for this device (drivers/dma/ioat/) and also based on previous work from Peter Shier <pshier@google.com>. The driver aims to be as simple as possible. It uses a single descriptor to issue DMA operations, and only supports the copy operation. For "DMA storms", the driver kicks off the maximum number of maximum-sized DMA operations. On Skylake server parts, this was 2^16-1 copies of size 2M and lasts about 15 seconds. Create symlinks to drivers/dma/ioat/{hw.h,registers.h} to get access to various macros (e.g. IOAT_CHANCMD_RESET) and struct ioat_dma_descriptor. Cc: Dave Jiang <dave.jiang@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Acked-by: Dave Jiang <dave.jiang@intel.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-20-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.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.