Re: [PATCH v3 14/15] acpi: factor out fw_cfg_add_acpi_dsdt()

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 29 Apr 2020 16:00:02 +0200
Gerd Hoffmann <kraxel@redhat.com> wrote:

> Add helper function to add fw_cfg device,
> also move code to hw/i386/fw_cfg.c.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

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

> ---
>  hw/i386/fw_cfg.h     |  1 +
>  hw/i386/acpi-build.c | 24 +-----------------------
>  hw/i386/fw_cfg.c     | 28 ++++++++++++++++++++++++++++
>  3 files changed, 30 insertions(+), 23 deletions(-)
> 
> diff --git a/hw/i386/fw_cfg.h b/hw/i386/fw_cfg.h
> index 9e742787792b..275f15c1c5e8 100644
> --- a/hw/i386/fw_cfg.h
> +++ b/hw/i386/fw_cfg.h
> @@ -25,5 +25,6 @@ FWCfgState *fw_cfg_arch_create(MachineState *ms,
>                                 uint16_t apic_id_limit);
>  void fw_cfg_build_smbios(MachineState *ms, FWCfgState *fw_cfg);
>  void fw_cfg_build_feature_control(MachineState *ms, FWCfgState *fw_cfg);
> +void fw_cfg_add_acpi_dsdt(Aml *scope, FWCfgState *fw_cfg);
>  
>  #endif
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 643e875c05a5..a8b790021974 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1874,30 +1874,8 @@ 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);
> +        fw_cfg_add_acpi_dsdt(scope, x86ms->fw_cfg);
>          aml_append(dsdt, scope);
>      }
>  
> diff --git a/hw/i386/fw_cfg.c b/hw/i386/fw_cfg.c
> index da60ada59462..c55abfb01abb 100644
> --- a/hw/i386/fw_cfg.c
> +++ b/hw/i386/fw_cfg.c
> @@ -15,6 +15,7 @@
>  #include "qemu/osdep.h"
>  #include "sysemu/numa.h"
>  #include "hw/acpi/acpi.h"
> +#include "hw/acpi/aml-build.h"
>  #include "hw/firmware/smbios.h"
>  #include "hw/i386/fw_cfg.h"
>  #include "hw/timer/hpet.h"
> @@ -179,3 +180,30 @@ void fw_cfg_build_feature_control(MachineState *ms, FWCfgState *fw_cfg)
>      *val = cpu_to_le64(feature_control_bits | FEATURE_CONTROL_LOCKED);
>      fw_cfg_add_file(fw_cfg, "etc/msr_feature_control", val, sizeof(*val));
>  }
> +
> +void fw_cfg_add_acpi_dsdt(Aml *scope, FWCfgState *fw_cfg)
> +{
> +    /*
> +     * 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
> +     */
> +    Object *obj = OBJECT(fw_cfg);
> +    uint8_t io_size = object_property_get_bool(obj, "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);
> +}