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The drivers which use shared iommu, bitmask need xor BIT(DRIVER_TYPE), and DRIVER_TYPE is defined in mpp_common.h. Such as, avsd、vdpu、iep add vdpp use share iommu, then bitmask = BIT(DRIVER_VDPU1) | BIT(DRIVER_VDPU2) | BIT(DRIVER_IEP2) | BIT(DRIVER_VDPP). Change-Id: Ifc8de7422eaa11ba33e9f5e93e4f4b094207a72e Signed-off-by: Ding Wei <leo.ding@rock-chips.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.