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Linux 6.13 PCI: AMD Enables PCIe TPH For Zen 5 Servers, Intel Adds PCIe Cooling Driver
Sent out today were the big set of PCI subsystem updates ready to be merged for the Linux 6.13 kernel
Going back to May long before the 5th Gen EPYC "Turin" processors were introduced, AMD was working on the PCIe TPH Linux support and that code was on my radar. In addition to this PCIe TLP Processing Hints infrastructure, the PCI pull request also includes improved logic for trusting built-in Thunderbolt controllers, better handling of ASPM L1 per specifications, enabling runtime power management for host bridges, re-introducing Link Bandwidth notification support after the code was previously reverted, and the Intel PCIe cooling driver for reducing bandwidth when hardware is running hot. Intel engineers had been working on the PCIe cooling driver since last year for being able to reduce the link speed to cope with thermal problems.
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