On Fri, 2022-03-18 at 15:30 -0600, Vishal Verma wrote: > Changes since v1[1]: > - Update changelogs for both patches (Dan) > - Fix support/control calculation to be based off CONFIG_MEMORY_FAILURE > (Dan) > - Use defines instead of magic numbers in a few places in patch 2 > (Jonathan) > - Fix 'capbuf' array to be the correct 5 elements. ACPI previously had > '6' where only 3 were needed. With CXL capabilities, now, 5 are > needed. (Jonathan). > - Fix a couple of uninitialized variable warnings reported by 0day/lkp. > - Drop 'RFC' annotation for the set > > 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/linux-cxl/146514b2e5237a3c027239a75ace69e72671d4c8.camel@xxxxxxxxx/T/#t > [2]: https://gitlab.com/jic23/qemu/-/tree/cxl-v7-draft-2-for-test > [3]: https://gitlab.com/jic23/qemu/-/commit/31c85054b84645dfbd9e9bb14aa35286141c14cf Logistical question - Rafael, do you expect this to go through ACPI, or should Dan pick it up to go through the CXL tree? > > > 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 | 14 +++ > include/acpi/acpi_bus.h | 7 +- > drivers/acpi/pci_root.c | 204 ++++++++++++++++++++++++++++++++++------ > 3 files changed, 193 insertions(+), 32 deletions(-) > > > base-commit: 74be98774dfbc5b8b795db726bd772e735d2edd4
