On Thu, 2022-03-17 at 15:19 +0000, Jonathan Cameron wrote: > On Wed, 16 Mar 2022 18:27:02 -0600 > Vishal Verma <vishal.l.verma@xxxxxxxxx> wrote: > > > 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. > > _OSC is implemented by the firmware of a host not the device so perhaps > rephrase this. Yes good point - I'll reword to say "CXL-1.1 platforms" > > > > > 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 > > Glad that worked :) I was wondering if it was correct. > There are some issues with that code raised in a recent review, so good > to have this to test against it going forwards. Thanks for taking a look and moving the qemu series forward! > > Thanks, > > Jonathan > > > > > 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 >
