veyepar: Gen-Z on Linux: Supporting a New System Interconnect in Free Software

Author(s):	Keith Packard
Location	C1
Date	jan Tue 22	Days Raw Files
Start	16:15	First Raw Start	15:46
Duration	0:25:0	Offset	0:28:29
End	16:40	Last Raw End	16:46
Chapters	00:00
Total cuts_time	23 min.

https://2019.linux.conf.au/schedule/presentation/232/
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System interconnects is a term which spans a wide range of wiring
techniques within computer systems. The term encompasses everything
from memory connections like DDR, processor-to-processor links like
UPI or Infinity Fabric, device connection links like USB or PCIe to
machine-to-machine connections like Infiniband or Ethernet.

Gen-Z is an interconnect which can span this whole range. Gen-Z is
being developed by a broad industry consortium as an open standard and
has reached version 1.0, making it ready for implementation in
hardware and software.

Within Linux, system interconnects support requires infrastructure
that provides device drivers access to low-level interconnect
interface hardware. This infrastructure offers discovery, addressing
and communication abstraction so that device drivers need not
implement direct support for the low-level interconnect hardware
itself. Linux offers as many interconnect abstractions as there are
supported interconnects, from packets for networking through blocks
for storage and URBs for USB. Gen-Z will also require new abstractions
and management methods

Gen-Z provides broad capabilities and uses ideas from a broad range of
existing hardware. Adding Gen-Z support to Linux will require a
similarly broad range of techniques, some adapted from existing
subsystems and some purpose-built.

This presentation will first describe what Gen-Z is and how it works,
describe a freely available Gen-Z emulator and then discuss the
current architecture for Linux support of Gen-Z. Finally, the
simulator will be used to show the current state of the Linux Gen-Z
subsystem development.

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