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OFS / linux-dfl-backport

Backport version of the linux-dfl (Device Feature List) kernel driver for FPGA devices. This is an out-of-tree driver, designed to be built, packaged, and installed as a stand-alone set of driver modules.
GNU General Public License v2.0
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fpga: dfl: Add GUID support in mod device table #144

Open pcolberg opened 2 months ago

pcolberg commented 2 months ago

In the modalias table, dfl devices use the type id and feature id to create the dfl device string entry "dfl:t0000f0009*". This patch adds support for the use of a GUID for dfl devices. Device drivers may match on type id and feature id, on the GUID, or on a combination of the type id, feature id and GUID.

If the feature id and GUID are both non-zero, then the modalias string is: "dfl:t0000f0009g{03020100-0504-0706-0809-0A0B0C0D0E0F}*" If the feature id is zero and the GUID is non-zero, then the string is: "dfl:t*f*g{03020100-0504-0706-0809-0A0B0C0D0E0F}*" If the feature id is non-zero and the GUID is zero, then the string is "dfl:t0000f0009*"

Followed the concept of the wmi device ID to define the GUID in string format and reuse the existing GUID infrastructure.

pcolberg commented 2 months ago

This PR follows up on https://github.com/OFS/linux-dfl-backport/pull/143#issuecomment-2389731812.