linux/include/acpi
Dan Williams 241d26bc26 PCI/ACPI: Prefer CXL _OSC instead of PCIe _OSC for CXL host bridges
OB In preparation for negotiating OS control of CXL _OSC features, do the
minimal enabling to use CXL _OSC to handle the base PCIe feature
negotiation. Recall that CXL _OSC is a super-set of PCIe _OSC and the
CXL 2.0 specification mandates: "If a CXL Host Bridge device exposes CXL
_OSC, CXL aware OSPM shall evaluate CXL _OSC and not evaluate PCIe
_OSC."

Rather than pass a boolean flag alongside @root to all the helper
functions that need to consider PCIe specifics, add is_pcie() and
is_cxl() helper functions to check the flavor of @root. This also
allows for dynamic fallback to PCIe _OSC in cases where an attempt to
use CXL _OXC fails. This can happen on CXL 1.1 platforms that publish
ACPI0016 devices to indicate CXL host bridges, but do not publish the
optional CXL _OSC method. CXL _OSC is mandatory for CXL 2.0 hosts.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Robert Moore <robert.moore@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Link: https://lore.kernel.org/r/20220413073618.291335-3-vishal.l.verma@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2022-04-28 14:01:54 -07:00
..
platform ACPICA: Use uintptr_t and offsetof() in Linux kernel builds 2022-01-25 18:41:23 +01:00
acbuffer.h ACPICA: Add _PLD panel positions 2021-06-07 14:04:43 +02:00
acconfig.h ACPICA: Add support for PlatformRtMechanism OperationRegion handler 2021-06-07 14:04:43 +02:00
acexcep.h ACPICA: Updated all copyrights to 2021 2021-01-22 15:51:53 +01:00
acnames.h ACPICA: Add method name "_DIS" For use with aslmethod.c 2021-08-16 16:47:02 +02:00
acoutput.h ACPICA: Macros should not use a trailing semicolon 2021-08-16 16:47:02 +02:00
acpi_bus.h PCI/ACPI: Prefer CXL _OSC instead of PCIe _OSC for CXL host bridges 2022-04-28 14:01:54 -07:00
acpi_drivers.h Merge branches 'acpi-pci' and 'acpi-processor' 2021-04-26 17:03:05 +02:00
acpi_io.h Revert "ACPI: Add memory semantics to acpi_os_map_memory()" 2021-09-23 20:39:36 +02:00
acpi_lpat.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
acpi_numa.h ACPI: processor: Replace kernel.h with the necessary inclusions 2021-11-24 17:44:04 +01:00
acpi.h ACPICA: Updated all copyrights to 2021 2021-01-22 15:51:53 +01:00
acpiosxf.h ACPICA: Updated all copyrights to 2021 2021-01-22 15:51:53 +01:00
acpixf.h ACPICA: Update version to 20211217 2021-12-27 17:01:28 +01:00
acrestyp.h ACPICA: ACPI 6.4: add CSI2Bus resource template 2021-04-07 19:09:01 +02:00
actbl1.h ACPICA: Headers: Add new DBG2 Serial Port Subtypes 2021-08-16 16:47:02 +02:00
actbl2.h ACPICA: iASL/NHLT table: "Specific Data" field support 2021-12-27 17:01:28 +01:00
actbl3.h ACPICA: ACPI 6.4 SRAT: add Generic Port Affinity type 2021-10-05 15:53:37 +02:00
actbl.h ACPICA: Updated all copyrights to 2021 2021-01-22 15:51:53 +01:00
actypes.h ACPICA: Use uintptr_t and offsetof() in Linux kernel builds 2022-01-25 18:41:23 +01:00
acuuid.h ACPICA: ACPI 6.4: add USB4 capabilities UUID 2021-04-07 19:09:00 +02:00
apei.h ACPI: APEI: rename ghes_init() with an "acpi_" prefix 2022-03-03 20:25:23 +01:00
battery.h ACPI: battery: include linux/power_supply.h 2020-09-25 18:31:19 +02:00
button.h ACPI: button: move HIDs to acpi/button.h 2020-02-13 23:36:23 +01:00
cppc_acpi.h ACPI: CPPC: Add CPPC enable register function 2021-12-30 18:51:39 +01:00
ghes.h ACPI / APEI: Add a notifier chain for unknown (vendor) CPER records 2020-09-16 10:30:42 +01:00
hed.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
nfit.h acpi, nfit: Add function to look up nvdimm device and provide SMBIOS handle 2018-03-14 12:43:50 +01:00
pcc.h mailbox: pcc: Use PCC mailbox channel pointer instead of standard 2021-10-29 22:46:38 -05:00
pdc_intel.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor.h ACPI: processor: Replace kernel.h with the necessary inclusions 2021-11-24 17:44:04 +01:00
reboot.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
video.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00