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Add debugfs files for NVMe Direct I/O (HLDIO) functionality.
This interface allows userspace access to direct SSD ↔ device transfers
through debugfs nodes.
Four debugfs files are created under /sys/kernel/debug/habanalabs/hlN/:
- dio_ssd2hl : trigger SSD-to-device transfers
- dio_hl2ssd : trigger device-to-SSD transfers
(placeholder, not yet implemented)
- dio_stats : show transfer statistics
- dio_reset : reset statistics counters
Usage examples:
# Perform SSD → device transfer
echo "fd=3 va=0x10000 off=0 len=4096" > \
/sys/kernel/debug/habanalabs/hl0/dio_ssd2hl
# View statistics
cat /sys/kernel/debug/habanalabs/hl0/dio_stats
# Reset counters
echo 1 > /sys/kernel/debug/habanalabs/hl0/dio_reset
This interface provides access to HLDIO functionality for validation
and diagnostics.
Signed-off-by: Konstantin Sinyuk <konstantin.sinyuk@intel.com>
Reviewed-by: Farah Kassabri <farah.kassabri@intel.com>
Reviewed-by: Koby Elbaz <koby.elbaz@intel.com>
Signed-off-by: Koby Elbaz <koby.elbaz@intel.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.