Re: [PATCH 02/13] acpi: factor out acpi_dsdt_add_fw_cfg()

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 19 Mar 2020 09:01:06 +0100
Gerd Hoffmann <kraxel@redhat.com> wrote:

> Add helper function to add fw_cfg device.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/i386/acpi-build.c | 50 ++++++++++++++++++++++++--------------------
>  1 file changed, 27 insertions(+), 23 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 1b0684c433e3..9c98b07116cc 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1822,6 +1822,32 @@ static void build_smb0(Aml *table, I2CBus *smbus, int devnr, int func)
>      aml_append(table, scope);
>  }
>  
> +static void acpi_dsdt_add_fw_cfg(Aml *scope, Object *fw_cfg)
I'd pass fwcfg type as is and then cast to OBJECT inside of this function

> +{
> +    /*
> +     * when using port i/o, the 8-bit data register *always* overlaps
> +     * with half of the 16-bit control register. Hence, the total size
> +     * of the i/o region used is FW_CFG_CTL_SIZE; when using DMA, the
> +     * DMA control register is located at FW_CFG_DMA_IO_BASE + 4
> +     */
> +    uint8_t io_size = object_property_get_bool(fw_cfg, "dma_enabled", NULL) ?
> +        ROUND_UP(FW_CFG_CTL_SIZE, 4) + sizeof(dma_addr_t) :
> +        FW_CFG_CTL_SIZE;
> +    Aml *dev = aml_device("FWCF");
> +    Aml *crs = aml_resource_template();
> +
> +    aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
> +
> +    /* device present, functioning, decoding, not shown in UI */
> +    aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
> +
> +    aml_append(crs,
> +        aml_io(AML_DECODE16, FW_CFG_IO_BASE, FW_CFG_IO_BASE, 0x01, io_size));
> +
> +    aml_append(dev, aml_name_decl("_CRS", crs));
> +    aml_append(scope, dev);
> +}
> +
>  static void
>  build_dsdt(GArray *table_data, BIOSLinker *linker,
>             AcpiPmInfo *pm, AcpiMiscInfo *misc,
> @@ -2101,30 +2127,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>  
>      /* create fw_cfg node, unconditionally */
>      {
> -        /* when using port i/o, the 8-bit data register *always* overlaps
> -         * with half of the 16-bit control register. Hence, the total size
> -         * of the i/o region used is FW_CFG_CTL_SIZE; when using DMA, the
> -         * DMA control register is located at FW_CFG_DMA_IO_BASE + 4 */
> -        uint8_t io_size = object_property_get_bool(OBJECT(x86ms->fw_cfg),
> -                                                   "dma_enabled", NULL) ?
> -                          ROUND_UP(FW_CFG_CTL_SIZE, 4) + sizeof(dma_addr_t) :
> -                          FW_CFG_CTL_SIZE;
> -
>          scope = aml_scope("\\_SB.PCI0");
> -        dev = aml_device("FWCF");
> -
> -        aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
> -
> -        /* 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, FW_CFG_IO_BASE, FW_CFG_IO_BASE, 0x01, io_size)
> -        );
> -        aml_append(dev, aml_name_decl("_CRS", crs));
> -
> -        aml_append(scope, dev);
> +        acpi_dsdt_add_fw_cfg(scope, OBJECT(x86ms->fw_cfg));
>          aml_append(dsdt, scope);
>      }
>