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The UFS host software uses a combination of a host register set and
Transfer Request Descriptors in system memory to communicate with host
controller hardware. In its mmio space, a separate places are assigned
to UTP Transfer Request Descriptor ("utrd") list, and to UTP Task
Management Request Descriptor ("utmrd") list.
The provided API supports utrd-typed requests: nop out and device
management commands. It also supports utmrd-type requests:
task management requests. Other UPIU types are not supported for now.
We utilize the already existing code for tag and task work queues.
That is, all utrd-typed UPIUs are "disguised" as device management
commands. Similarly, the utmrd-typed UPUIs uses the task management
infrastructure.
It is up to the caller to fill the upiu request properly, as it will be
copied without any further input validations.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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| kernel | ||
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| README | ||
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.