Huawei Kunpeng HCCS Cache Coherence System driver
Management interface for the Hydra Cache Coherence System (HCCS) links that tie together CPU dies and sockets in Huawei's Kunpeng server processors, used in TaiShan 200 and newer datacenter servers. It exposes link health, port status, and bandwidth controls through sysfs so operators can monitor and tune the inter-die fabric on these ARM64 server SoCs.
recommendation
It should stay because the hardware is current Huawei datacenter silicon: Kunpeng 920-based TaiShan 200 servers are still supported in 2025 and Huawei has publicly committed to a Kunpeng 950 / TaiShan 950 roadmap landing in early 2026. The driver itself shows healthy upstream activity, with feature additions and fixes through 2024 and a maintainer-applied patch as recently as August 2025, and there is no in-tree alternative for managing HCCS links on these platforms.
repository signals
sources
- lkml.org
Upstream patch series added the Kunpeng HCCS driver in 2023 as a real hardware driver for Huawei's Cache Coherence System on Kunpeng SoCs.
- spinics.net
A 2024 five-patch series added features and bug fixes for kunpeng_hccs, showing post-merge maintenance and feature growth rather than abandonment.
- spinics.net
In April 2025, upstream still carried cleanup work specific to kunpeng_hccs as PCC core behavior evolved, indicating active integration maintenance.
- spinics.net
In August 2025, a maintainer replied that a kunpeng_hccs patch had been applied to the Hisilicon driver tree, showing current upstream attention and no visible removal trajectory.
- support.huawei.com
Huawei documentation updated in 2025 describes TaiShan 200 servers powered by Kunpeng 920 processors for data-center workloads, indicating ongoing deployed product support.
- huawei.com
Huawei announced continuing Kunpeng server roadmap items in 2025, including Kunpeng 950 and TaiShan 950 SuperPoD availability in early 2026, supporting the view that the platform family remains current rather than legacy-only.
codex reasoning notes (technical)
Local inspection via shell showed this is the single-module platform driver `kunpeng_hccs` with ACPI IDs and sysfs functionality, not a helper library. Local `git log` showed continuous non-treewide touches from 2023 through 2025. Public evidence was gathered via web search because lore MCP was unavailable and `lei` was not installed: LKML/spinics hits show initial submission plus 2024-2025 fixes/feature work and an applied 2025 patch, with no removal discussion found in searches. Huawei support/news pages obtained via web search/open show Kunpeng/TaiShan server products and roadmap still active in 2025, so the hardware family is still relevant for new and existing datacenter deployments. No natural in-tree replacement exists for HCCS management on Kunpeng platforms.