Changes since v1[1]: - Reword commit message (Dan) - Move the OSC capability size definition and usage into patch 1 (Davidlohr) - Clean up some unnecessary parens (Rafael) - Avoid repetitive strcmp()'s in is_pcie()/is_cxl() helpers (Rafael) - Clean up some pointer math (Rafael) - Fix a copy-paste error in updating the saved OSC mask (Rafael) - Fix a bug where we'd try to print missing OSC bits when we should've been printing missing PCI bits. 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 platforms 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[2], which adds the CXL _OSC (in addition to other CXL support). Specifically, _OSC support is added here[3]. [1]: https://lore.kernel.org/all/20220318213004.2287428-1-vishal.l.verma@xxxxxxxxx/ [2]: https://gitlab.com/jic23/qemu/-/tree/cxl-v8-draft [3]: https://gitlab.com/jic23/qemu/-/commit/1d67df6b6e3716c27462873f3451956f5c0673a3 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 | 20 +++- include/acpi/acpi_bus.h | 12 ++- drivers/acpi/pci_root.c | 225 ++++++++++++++++++++++++++++++++++------ 3 files changed, 224 insertions(+), 33 deletions(-) base-commit: 05e815539f3f161585c13a9ab023341bade2c52f -- 2.35.1
