Re: [PATCH v2 04/25] hw/pci-host/gpex-acpi: Add native_pci_hotplug arg to acpi_dsdt_add_pci_osc

[Igor Mammedov <imammedo@redhat.com>]

On Tue, 27 May 2025 09:40:06 +0200
Eric Auger <eric.auger@redhat.com> wrote:

> Add a new argument to acpi_dsdt_add_pci_osc to be able to disable
> native pci hotplug.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Gustavo Romero <gustavo.romero@linaro.org>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> 
> ---
> 
> rfc -> v1:
> - updated the "Allow OS control for all 5 features" comment
> ---
>  hw/pci-host/gpex-acpi.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/pci-host/gpex-acpi.c b/hw/pci-host/gpex-acpi.c
> index 0aba47c71c..f34b7cf25e 100644
> --- a/hw/pci-host/gpex-acpi.c
> +++ b/hw/pci-host/gpex-acpi.c
> @@ -50,7 +50,7 @@ static void acpi_dsdt_add_pci_route_table(Aml *dev, uint32_t irq,
>      }
>  }
>  
> -static void acpi_dsdt_add_pci_osc(Aml *dev)
> +static void acpi_dsdt_add_pci_osc(Aml *dev, bool enable_native_pcie_hotplug)
>  {
>      Aml *method, *UUID, *ifctx, *ifctx1, *elsectx, *buf;
>  
> @@ -77,11 +77,12 @@ static void acpi_dsdt_add_pci_osc(Aml *dev)
>      aml_append(ifctx, aml_store(aml_name("CDW3"), aml_name("CTRL")));
>  
>      /*
> -     * Allow OS control for all 5 features:
> -     * PCIeHotplug SHPCHotplug PME AER PCIeCapability.
> +     * 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(0x1F),
> -                              aml_name("CTRL")));
> +    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),
> @@ -192,7 +193,7 @@ void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *cfg)
>              if (is_cxl) {
>                  build_cxl_osc_method(dev);
>              } else {
> -                acpi_dsdt_add_pci_osc(dev);
> +                acpi_dsdt_add_pci_osc(dev, true);
>              }
>  
>              aml_append(scope, dev);
> @@ -267,7 +268,7 @@ void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *cfg)
>      }
>      aml_append(dev, aml_name_decl("_CRS", rbuf));
>  
> -    acpi_dsdt_add_pci_osc(dev);
> +    acpi_dsdt_add_pci_osc(dev, true);
>  
>      Aml *dev_res0 = aml_device("%s", "RES0");
>      aml_append(dev_res0, aml_name_decl("_HID", aml_string("PNP0C02")));