On 4/23/2022 12:24 AM, Verma, Vishal L wrote:
On Wed, 2022-04-13 at 01:36 -0600, Vishal Verma wrote:
Changes since v5[1]:
- Collect an reviewed-by tags from Rafael, Adam, and David
- Fix a couple of missed s/CXL/extended/ in acpi_bus.h (Rafael)
Rafael, or Bjorn,
Dan has offered to take this through cxl.git. Any objections to that -
would you prefer it to go through either the PCI or ACPI trees instead?
This would be fine with me, but I can take the series too.
Add support for using the CXL definition of _OSC where applicable, and
negotiating CXL specific support and control bits.
Patch 1 is a preliminary cleanup that replaces open-coded pointer
arithmetic to retrieve the Control DWORD with an inline helper.
Patch 2 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 3 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/20220406023746.2807328-1-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: Prefer CXL _OSC instead of PCIe _OSC for CXL host bridges
Vishal Verma (2):
PCI/ACPI: add a helper for retrieving _OSC Control DWORDs
PCI/ACPI: negotiate CXL _OSC
include/linux/acpi.h | 42 ++++++-
include/acpi/acpi_bus.h | 12 +-
drivers/acpi/bus.c | 2 +-
drivers/acpi/pci_root.c | 240 +++++++++++++++++++++++++++++++++++-----
4 files changed, 262 insertions(+), 34 deletions(-)
base-commit: 05e815539f3f161585c13a9ab023341bade2c52f
