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This patch changes the driver to create two char devices for each ASIC it discovers. This is done to allow system/monitoring applications to query the device for stats, information, idle state and more, while also allowing the deep-learning application to send work to the ASIC. One char device is the original device, hlX. IOCTL calls through this device file can perform any task on the device (compute, memory, queries). The open function for this device will fail if it was called before but the file-descriptor it created was not completely released yet (the release callback function is not called from the kernel until all instances of that FD are closed). The driver needs to keep this behavior to support backward compatibility with existing userspace, which count that the open will fail if the device is "occupied". The second char device is called "hl_controlDx", where x is the same index of the main device with a minor number of the original char device + 1. Applications that open this device can only call the INFO IOCTL. There is no limitation on the number of applications opening this device. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.