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The user space polls on the wait_queue for the payload from the specific source. The hypervisor interrupts the OS when the pipe status for the specific source is changed such as payload is available for the partition or pipe to the source is closed. The OS retrieves the HVPIPE event message with check-exception RTAS and event message contains the source ID and the pipe status. Then wakes up all FDs waiting on the wait_queue so that the user space can read the payload or close the FD if the pipe to source in the hypervisor is closed. The hypervisor assigns one pipe per partition for all sources. Hence issue ibm,receive-hvpipe-msg() to read the pending payload during release() before closing FD so that pipe to the partition will not be blocked. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Tested-by: Shashank MS <shashank.gowda@in.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250909084402.1488456-7-haren@linux.ibm.com |
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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.