Re: [Qemu-devel] [PATCH-for-4.2 v7 08/10] hw/acpi: Add system power down support to GED

[Igor Mammedov <imammedo@redhat.com>]

On Tue, 16 Jul 2019 16:38:14 +0100
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> wrote:

> This adds support to use GED for system power down event.
[...]

> @@ -232,6 +238,13 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
>      acpi_ged_event(s, sel);
>  }
>  
> +static void acpi_ged_pm_powerdown_req(Notifier *n, void *opaque)
> +{
> +    AcpiGedState *s = container_of(n, AcpiGedState, powerdown_notifier);
> +
> +    acpi_ged_event(s, ACPI_GED_PWR_DOWN_EVT);
> +}
> +
>  static void acpi_ged_device_realize(DeviceState *dev, Error **errp)
>  {
>      AcpiGedState *s = ACPI_GED(dev);
> @@ -243,6 +256,9 @@ static void acpi_ged_device_realize(DeviceState *dev, Error **errp)
>      }
>  
>      acpi_ged_init(get_system_memory(), dev, &s->ged_state);
> +
> +    s->powerdown_notifier.notify = acpi_ged_pm_powerdown_req;

one more thing:
I'd reuse virt_powerdown_req() instead.

pass it machine pointer and then from notifier you'd be able to get to acpi_dev

> +    qemu_register_powerdown_notifier(&s->powerdown_notifier);
>  }
>  
>  static Property acpi_ged_properties[] = {
> diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
> index f69d084c89..9e63b72cb9 100644
> --- a/include/hw/acpi/generic_event_device.h
> +++ b/include/hw/acpi/generic_event_device.h
> @@ -61,6 +61,8 @@
>  
>  #include "hw/acpi/memory_hotplug.h"
>  
> +#define ACPI_POWER_BUTTON_DEVICE "PWRB"
> +
>  #define TYPE_ACPI_GED "acpi-ged"
>  #define ACPI_GED(obj) \
>      OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED)
> @@ -79,6 +81,7 @@
>   * through GED.
>   */
>  #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
> +#define ACPI_GED_PWR_DOWN_EVT      0x2
>  
>  typedef struct GEDState {
>      MemoryRegion io;
> @@ -88,6 +91,7 @@ typedef struct GEDState {
>  
>  typedef struct AcpiGedState {
>      DeviceClass parent_obj;
> +    Notifier powerdown_notifier;
>      MemHotplugState memhp_state;
>      hwaddr memhp_base;
>      hwaddr ged_base;