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/* SPDX-License-Identifier: GPL-2.0-only */
#define PCI_HOST_BRIDGE_OSC_UUID "33db4d5b-1ff7-401c-9657-7441c03dd766"
#define CXL_HOST_BRIDGE_OSC_UUID "68f2d50b-c469-4d8a-bd3d-941a103fd3fc"
#define OSC_RET_FAILURE 0x02
#define OSC_RET_UNRECOGNIZED_UUID 0x04
#define OSC_RET_UNRECOGNIZED_REV 0x08
#define OSC_RET_CAPABILITIES_MASKED 0x10
#define OSC_QUERY_SUPPORT_SET 0x01
#define ASL_UUID_UNHANDLED 0x00
#define ASL_UUID_HANDLED 0x01
Scope (\_SB)
{
/*
* \_SB.POSC - OSC handler for PCIe _OSC calls
*
* Reference:
* 6.2.11 in https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/06_Device_Configuration/Device_Configuration.html
*
* Note:
* This call negotiate with OS on fixed firmware capabilities. It doesn't support to runtime
* change firmware settings.
*
* Arguments: (7)
* Arg0 - Map to _OSC Arg0. A Buffer containing a UUID
* Arg1 - Map to _OSC Arg1. An Integer containing a Revision ID of the buffer format
* Arg2 - Map to _OSC Arg2. An Integer containing a count of entries in Arg3
* Arg3 - Map to _OSC Arg3. A Buffer containing a list of DWORD capabilities
* Arg4 - GrantedPCIeFeatures
* Arg5 - IsCxlDomain
* Arg6 - GrantedCxlFeatures
*
* _OSC ASL Return Value:
* A Buffer containing a list of capabilities
*
* Local Variables Assignment:
* Local0 - Not used
* Local1 - Not used
* Local2 - Not used
* Local3 - Not used
* Local4 - Not used
* Local5 - Not used
* Local6 - Record whether the UUID is handled
* Local7 - Backs up the input value of Arg3
*
* Field Definitions:
* Name - Width Source Offset Description
* --------------------------------
* RETE - DWord Arg3 0x00 Returned errors
* SUPP - Dword Arg3 0x04 PCIe Features that OS supported
* CTRL - Dword Arg3 0x08 PCIe Features that firmware grant control to OS
* OTRL - Dword Local7 0x08 PCIe Features that OS requests for control
* SUPC - Dword Arg3 0x0C CXL Features that OS supported
* CTRC - Dword Arg3 0x10 CXL Features that firmware grant control to OS
* OTRC - Dword Local7 0x10 CXL Features that OS requests for control
*/
Method (POSC, 7, NotSerialized)
{
#define OscArg0 Arg0
#define OscArg1 Arg1
#define OscArg2 Arg2
#define OscArg3 Arg3
#define GrantedPCIeFeatures Arg4
#define IsCxlDomain Arg5
#define GrantedCxlFeatures Arg6
Local7 = OscArg3
CreateDWordField (OscArg3, Zero, RETE)
RETE = 0x0
Local6 = ASL_UUID_UNHANDLED
If ((OscArg1 != 0x01))
{
RETE = OSC_RET_UNRECOGNIZED_REV
Return (OscArg3)
}
If ((OscArg2 < 0x03))
{
RETE = OSC_RET_FAILURE
Return (OscArg3)
}
If ((OscArg0 == ToUUID (PCI_HOST_BRIDGE_OSC_UUID)) ||
((IsCxlDomain != 0x00) &&
(OscArg0 == ToUUID (CXL_HOST_BRIDGE_OSC_UUID))))
{
CreateDWordField (OscArg3, 0x04, SUPP)
CreateDWordField (OscArg3, 0x08, CTRL)
CreateDWordField (Local7, 0x08, OTRL)
CTRL &= GrantedPCIeFeatures
/* TODO: further suppress CTRL bits per SUPP caps */
If ((CTRL != OTRL))
{
RETE = OSC_RET_CAPABILITIES_MASKED
}
Local6 = ASL_UUID_HANDLED
}
If ((IsCxlDomain != 0x00) &&
(OscArg0 == ToUUID (CXL_HOST_BRIDGE_OSC_UUID)))
{
CreateDWordField (OscArg3, 0x0C, SUPC)
CreateDWordField (OscArg3, 0x10, CTRC)
CreateDWordField (Local7, 0x10, OTRC)
CTRC &= GrantedCxlFeatures
/* TODO: further suppress CTRC bits per SUPC caps */
If ((CTRC != OTRC))
{
RETE = OSC_RET_CAPABILITIES_MASKED
}
Local6 = ASL_UUID_HANDLED
}
If ((Local6 == ASL_UUID_UNHANDLED))
{
RETE = OSC_RET_UNRECOGNIZED_UUID
}
Return (OscArg3)
}
}
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