Add support for using the CXL definition of _OSC where applicable, and negotiating CXL specific support and control bits. Patch 1 adds the new CXL _OSC UUID, and uses it instead of the PCI UUID when a root port is CXL enabled. It provides a fallback method for CXL-1.1 devices that may not implement the CXL-2.0 _OSC. Patch 2 performs negotiation for the CXL specific _OSC support and control bits. I've tested these against a custom qemu[1], which adds the CXL _OSC (in addition to other CXL support). Specifically, _OSC support is added here[2]. [1]: https://gitlab.com/jic23/qemu/-/tree/cxl-v7-draft-2-for-test [2]: https://gitlab.com/jic23/qemu/-/commit/31c85054b84645dfbd9e9bb14aa35286141c14cf Dan Williams (1): PCI/ACPI: Use CXL _OSC instead of PCIe _OSC Vishal Verma (1): acpi/pci_root: negotiate CXL _OSC include/linux/acpi.h | 11 +++ include/acpi/acpi_bus.h | 7 +- drivers/acpi/pci_root.c | 201 ++++++++++++++++++++++++++++++++++------ 3 files changed, 187 insertions(+), 32 deletions(-) base-commit: 74be98774dfbc5b8b795db726bd772e735d2edd4 -- 2.35.1
