Public bug reported:
This patch series adds comprehensive CXL (Compute Express Link) support
to the nvidia-6.17 kernel, including:
1. CXL Type-2 device support - Enables accelerator devices (like GPUs
and SmartNICs) to use CXL for coherent memory access
2. CXL RAS (Reliability, Availability, Serviceability) error handling -
Implements PCIe Port Protocol error handling and logging for CXL devices
3. Prerequisite CXL driver updates - Cherry-picked commits from Linux
v6.18 that are required dependencies
Key Features Added:
CXL Type-2 accelerator device registration and memory management
CXL region creation by Type-2 drivers
DPA (Device Physical Address) allocation interface for accelerators
HPA (Host Physical Address) free space enumeration
CXL protocol error detection, forwarding, and recovery
RAS register mapping for CXL Endpoints and Switch Ports
Justification
CXL Type-2 device support is critical for next-generation NVIDIA
accelerators and data center workloads:
Enables coherent memory sharing between CPUs and accelerators
Supports firmware-provisioned CXL regions for accelerator memory
Provides proper error handling and reporting for CXL fabric errors
Required for upcoming NVIDIA hardware with CXL capabilities
Patch Breakdown (80 commits total):
Category Count Source
Revert old CXL reset 1 OOT (cleanup)
v6.18 CXL driver prerequisites 28 Upstream (cherry-picked from
torvalds/linux v6.18)
Terry Bowman's CXL RAS series 25 Upstream (RESEND v13)
Alejandro Lucero's Type-2 series 25 Upstream (v22)
CXL Config update 1 OOT (build config)
Lore Links:
Terry Bowman's CXL RAS series (RESEND v13):
https://lore.kernel.org/linux-cxl/[email protected]/
Alejandro Lucero's CXL Type-2 series (v22):
https://lore.kernel.org/linux-cxl/[email protected]/
Notes
CONFIG_CXL_BUS and CONFIG_CXL_PCI changed from tristate to bool by the
Type-2 patches (intentional design change for built-in CXL support)
Kernel config annotations updated in
debian.nvidia-6.17/config/annotations to reflect these changes
** Affects: linux-nvidia-6.17 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2143032
Title:
Add CXL Type-2 device support and CXL RAS error handling
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