Re: [PATCH v2 11/25] hw/i386/acpi-build: Introduce build_append_pcihp_resources() helper

[Igor Mammedov <imammedo@redhat.com>]

On Tue, 27 May 2025 09:40:13 +0200
Eric Auger <eric.auger@redhat.com> wrote:

> Extract the code that reserves resources for ACPI PCI hotplug
> into a new helper named build_append_pcihp_resources() and
> move it to pcihp.c. We will reuse it on ARM.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Gustavo Romero <gustavo.romero@linaro.org>

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


> ---
>  include/hw/acpi/pcihp.h |  2 ++
>  hw/acpi/pcihp.c         | 20 ++++++++++++++++++++
>  hw/i386/acpi-build.c    | 15 ++-------------
>  3 files changed, 24 insertions(+), 13 deletions(-)
> 
> diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h
> index 971451e8ea..8a46a414cc 100644
> --- a/include/hw/acpi/pcihp.h
> +++ b/include/hw/acpi/pcihp.h
> @@ -75,6 +75,8 @@ void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
>  
>  void build_acpi_pci_hotplug(Aml *table, uint64_t pcihp_addr);
>  void build_append_pci_dsm_func0_common(Aml *ctx, Aml *retvar);
> +void build_append_pcihp_resources(Aml *table,
> +                                  uint64_t io_addr, uint64_t io_len);
>  
>  /* Called on reset */
>  void acpi_pcihp_reset(AcpiPciHpState *s);
> diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
> index e0260f67e6..fb54c31f77 100644
> --- a/hw/acpi/pcihp.c
> +++ b/hw/acpi/pcihp.c
> @@ -685,6 +685,26 @@ void build_acpi_pci_hotplug(Aml *table, uint64_t pcihp_addr)
>      aml_append(table, scope);
>  }
>  
> +/* Reserve PCIHP resources */
> +void build_append_pcihp_resources(Aml *scope /* \\_SB.PCI0 */,
> +                                  uint64_t io_addr, uint64_t io_len)
> +{
> +    Aml *dev, *crs;
> +
> +    dev = aml_device("PHPR");
> +    aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A06")));
> +    aml_append(dev,
> +               aml_name_decl("_UID", aml_string("PCI Hotplug resources")));
> +    /* device present, functioning, decoding, not shown in UI */
> +    aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
> +    crs = aml_resource_template();
> +    aml_append(crs,
> +        aml_io(AML_DECODE16, io_addr, io_addr, 1, io_len)
> +    );
> +    aml_append(dev, aml_name_decl("_CRS", crs));
> +    aml_append(scope, dev);
> +}
> +
>  const VMStateDescription vmstate_acpi_pcihp_pci_status = {
>      .name = "acpi_pcihp_pci_status",
>      .version_id = 1,
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 91945f716c..52cef834ed 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1432,19 +1432,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>  
>      /* reserve PCIHP resources */
>      if (pm->pcihp_io_len && (pm->pcihp_bridge_en || pm->pcihp_root_en)) {
> -        dev = aml_device("PHPR");
> -        aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A06")));
> -        aml_append(dev,
> -            aml_name_decl("_UID", aml_string("PCI Hotplug resources")));
> -        /* device present, functioning, decoding, not shown in UI */
> -        aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
> -        crs = aml_resource_template();
> -        aml_append(crs,
> -            aml_io(AML_DECODE16, pm->pcihp_io_base, pm->pcihp_io_base, 1,
> -                   pm->pcihp_io_len)
> -        );
> -        aml_append(dev, aml_name_decl("_CRS", crs));
> -        aml_append(scope, dev);
> +        build_append_pcihp_resources(scope,
> +                                      pm->pcihp_io_base, pm->pcihp_io_len);
>      }
>      aml_append(dsdt, scope);
>