On 5/30/25 12:05 PM, Jonathan Cameron wrote:
> On Tue, 27 May 2025 09:40:11 +0200
> Eric Auger <eric.au...@redhat.com> wrote:
>
>> gpex build_host_bridge_osc() and x86 originated
>> build_pci_host_bridge_osc_method() are mostly identical.
>>
>> In GPEX, SUPP is set to CDW2 but is not further used. CTRL
>> is same as Local0.
>>
>> So let gpex code reuse build_pci_host_bridge_osc_method()
>> and remove build_host_bridge_osc().
>>
>> The disassembled DSDT difference is given below:
>>
>> * Original Table Header:
>> * Signature "DSDT"
>> - * Length 0x00001A4F (6735)
>> + * Length 0x00001A35 (6709)
>> * Revision 0x02
>> - * Checksum 0xBF
>> + * Checksum 0xDD
>> * OEM ID "BOCHS "
>> * OEM Table ID "BXPC "
>> * OEM Revision 0x00000001 (1)
>> @@ -1849,27 +1849,26 @@ DefinitionBlock ("", "DSDT", 2, "BOCHS ", "BXPC
>> ", 0x00000001)
>> {
>> CreateDWordField (Arg3, 0x04, CDW2)
>> CreateDWordField (Arg3, 0x08, CDW3)
>> - SUPP = CDW2 /* \_SB_.PCI0._OSC.CDW2 */
>> - CTRL = CDW3 /* \_SB_.PCI0._OSC.CDW3 */
>> - CTRL &= 0x1F
>> + Local0 = CDW3 /* \_SB_.PCI0._OSC.CDW3 */
>> + Local0 &= 0x1F
>> If ((Arg1 != One))
>> {
>> CDW1 |= 0x08
>> }
>>
>> - If ((CDW3 != CTRL))
>> + If ((CDW3 != Local0))
>> {
>> CDW1 |= 0x10
>> }
>>
>> - CDW3 = CTRL /* \_SB_.PCI0.CTRL */
>> - Return (Arg3)
>> + CDW3 = Local0
>> }
>> Else
>> {
>> CDW1 |= 0x04
>> - Return (Arg3)
>> }
>> +
>> + Return (Arg3)
>> }
>>
>> Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method
>>
>> Signed-off-by: Eric Auger <eric.au...@redhat.com>
>>
>> ---
>>
>> v1 -> v2:
>> - move in the dsdt.dsl diff in the commit message and remove useless
>> info (Gustavi, Michael)
>> ---
>> hw/pci-host/gpex-acpi.c | 60 +++--------------------------------------
>> 1 file changed, 4 insertions(+), 56 deletions(-)
>>
>> diff --git a/hw/pci-host/gpex-acpi.c b/hw/pci-host/gpex-acpi.c
>> index f1ab30f3d5..98c9868c3f 100644
>> --- a/hw/pci-host/gpex-acpi.c
>> +++ b/hw/pci-host/gpex-acpi.c
>> @@ -50,60 +50,7 @@ static void acpi_dsdt_add_pci_route_table(Aml *dev,
>> uint32_t irq,
>> }
>> }
>>
>> -static Aml *build_host_bridge_osc(bool enable_native_pcie_hotplug)
>> -{
>> - Aml *method, *UUID, *ifctx, *ifctx1, *elsectx;
>> -
>> - method = aml_method("_OSC", 4, AML_NOTSERIALIZED);
>> - aml_append(method,
>> - aml_create_dword_field(aml_arg(3), aml_int(0), "CDW1"));
>> -
>> - /* PCI Firmware Specification 3.0
>> - * 4.5.1. _OSC Interface for PCI Host Bridge Devices
>> - * The _OSC interface for a PCI/PCI-X/PCI Express hierarchy is
>> - * identified by the Universal Unique IDentifier (UUID)
>> - * 33DB4D5B-1FF7-401C-9657-7441C03DD766
>> - */
>> - UUID = aml_touuid("33DB4D5B-1FF7-401C-9657-7441C03DD766");
>> - ifctx = aml_if(aml_equal(aml_arg(0), UUID));
>> - aml_append(ifctx,
>> - aml_create_dword_field(aml_arg(3), aml_int(4), "CDW2"));
>> - aml_append(ifctx,
>> - aml_create_dword_field(aml_arg(3), aml_int(8), "CDW3"));
>> - aml_append(ifctx, aml_store(aml_name("CDW2"), aml_name("SUPP")));
>> - aml_append(ifctx, aml_store(aml_name("CDW3"), aml_name("CTRL")));
>> -
>> - /*
>> - * Allow OS control for SHPCHotplug, PME, AER, PCIeCapability,
>> - * and PCIeHotplug depending on enable_native_pcie_hotplug
>> - */
>> - aml_append(ifctx, aml_and(aml_name("CTRL"),
>> - aml_int(0x1E | (enable_native_pcie_hotplug ? 0x1 : 0x0)),
>> - aml_name("CTRL")));
>> -
>> - ifctx1 = aml_if(aml_lnot(aml_equal(aml_arg(1), aml_int(0x1))));
>> - aml_append(ifctx1, aml_or(aml_name("CDW1"), aml_int(0x08),
>> - aml_name("CDW1")));
>> - aml_append(ifctx, ifctx1);
>> -
>> - ifctx1 = aml_if(aml_lnot(aml_equal(aml_name("CDW3"),
>> aml_name("CTRL"))));
>> - aml_append(ifctx1, aml_or(aml_name("CDW1"), aml_int(0x10),
>> - aml_name("CDW1")));
>> - aml_append(ifctx, ifctx1);
>> -
>> - aml_append(ifctx, aml_store(aml_name("CTRL"), aml_name("CDW3")));
>> - aml_append(ifctx, aml_return(aml_arg(3)));
>> - aml_append(method, ifctx);
>> -
>> - elsectx = aml_else();
>> - aml_append(elsectx, aml_or(aml_name("CDW1"), aml_int(4),
>> - aml_name("CDW1")));
>> - aml_append(elsectx, aml_return(aml_arg(3)));
>> - aml_append(method, elsectx);
>> - return method;
>> -}
>> -
>> -static Aml *build_host_bridge_dsm(void)
>> +static Aml *build_pci_host_bridge_dsm_method(void)
>> {
>> Aml *method = aml_method("_DSM", 4, AML_NOTSERIALIZED);
>> Aml *UUID, *ifctx, *ifctx1, *buf;
>> @@ -134,8 +81,9 @@ static void acpi_dsdt_add_host_bridge_methods(Aml *dev,
>> aml_append(dev, aml_name_decl("SUPP", aml_int(0)));
>> aml_append(dev, aml_name_decl("CTRL", aml_int(0)));
> This is where they become unused I think...
Indeed.
This means that I need to regenerate the reference blobs accordingly
(for Gustavo's awarness).
Eric
>
>> /* Declare an _OSC (OS Control Handoff) method */
>> - aml_append(dev, build_host_bridge_osc(enable_native_pcie_hotplug));
>> - aml_append(dev, build_host_bridge_dsm());
>> + aml_append(dev,
>> +
>> build_pci_host_bridge_osc_method(enable_native_pcie_hotplug));
>> + aml_append(dev, build_pci_host_bridge_dsm_method());
>> }
>>
>> void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *cfg)
