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289b3b005c
We preset the access and dirty bits for IOVA over first level usage only for the kernel DMA (i.e., when domain type is IOMMU_DOMAIN_DMA). We should also preset the FL A/D for user space DMA usage. The idea is that even the user space A/D bit memory write is unnecessary. We should avoid it to minimize the overhead. Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210720013856.4143880-1-baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20210818134852.1847070-6-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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.