Re: [Qemu-devel] [RFC PATCH 1/4] hw:acpi: Make ACPI IO address space configurable

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 28 Jan 2019 11:05:43 +0000
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> wrote:

> This is in preparation for adding support for ARM64 platforms
> where it doesn't use port mapped IO for ACPI IO space.
> 
> Also add a flag to identify hw reduced ACPI platforms as they
> might use GPIO hw for signaling ACPI platform events.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
>  hw/acpi/memory_hotplug.c         | 13 ++++++++-----
>  hw/i386/acpi-build.c             |  3 ++-
>  include/hw/acpi/memory_hotplug.h |  6 ++++--
>  3 files changed, 14 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
> index 921cad2..05f1d45 100644
> --- a/hw/acpi/memory_hotplug.c
> +++ b/hw/acpi/memory_hotplug.c
> @@ -34,7 +34,7 @@
>  #define MEMORY_HOTPLUG_IO_LEN         24
>  #define MEMORY_DEVICES_CONTAINER     "\\_SB.MHPC"
>  
> -static uint16_t memhp_io_base;
> +static hwaddr memhp_io_base;
>  
>  static ACPIOSTInfo *acpi_memory_device_status(int slot, MemStatus *mdev)
>  {
> @@ -208,7 +208,7 @@ static const MemoryRegionOps acpi_memory_hotplug_ops = {
>  };
>  
>  void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
> -                              MemHotplugState *state, uint16_t io_base)
> +                              MemHotplugState *state, hwaddr io_base)
>  {
>      MachineState *machine = MACHINE(qdev_get_machine());
>  
> @@ -279,7 +279,9 @@ void acpi_memory_plug_cb(HotplugHandler *hotplug_dev, MemHotplugState *mem_st,
>      mdev->is_enabled = true;
>      if (dev->hotplugged) {
>          mdev->is_inserting = true;
> -        acpi_send_event(DEVICE(hotplug_dev), ACPI_MEMORY_HOTPLUG_STATUS);
> +        if (!mem_st->hw_reduced_acpi) {
> +            acpi_send_event(DEVICE(hotplug_dev), ACPI_MEMORY_HOTPLUG_STATUS);
> +        }
Why do you restrict it to non hw_reduced_acpi?

If anything else, I'd expect virt board (or hotplug controller (GED or whatever)
implement AcpiDeviceIfClass and implement arm/virt board specific call backs)

then you won't need duplicate and carry hw_reduced_acpi in generic code.

The rest of the patch looks good.

>      }
>  }
>  
> @@ -341,7 +343,8 @@ const VMStateDescription vmstate_memory_hotplug = {
>  
>  void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
>                                const char *res_root,
> -                              const char *event_handler_method)
> +                              const char *event_handler_method,
> +                              AmlRegionSpace rs)
>  {
>      int i;
>      Aml *ifctx;
> @@ -371,7 +374,7 @@ void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
>          aml_append(mem_ctrl_dev, aml_name_decl("_CRS", crs));
>  
>          aml_append(mem_ctrl_dev, aml_operation_region(
> -            MEMORY_HOTPLUG_IO_REGION, AML_SYSTEM_IO,
> +            MEMORY_HOTPLUG_IO_REGION, rs,
>              aml_int(memhp_io_base), MEMORY_HOTPLUG_IO_LEN)
>          );
>  
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 2e21a31..b62c1a3 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1852,7 +1852,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>          build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
>                         "\\_SB.PCI0", "\\_GPE._E02");
>      }
> -    build_memory_hotplug_aml(dsdt, nr_mem, "\\_SB.PCI0", "\\_GPE._E03");
> +    build_memory_hotplug_aml(dsdt, nr_mem, "\\_SB.PCI0",
> +                             "\\_GPE._E03", AML_SYSTEM_IO);
>  
>      scope =  aml_scope("_GPE");
>      {
> diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
> index 77c6576..ec56579 100644
> --- a/include/hw/acpi/memory_hotplug.h
> +++ b/include/hw/acpi/memory_hotplug.h
> @@ -26,10 +26,11 @@ typedef struct MemHotplugState {
>      uint32_t selector;
>      uint32_t dev_count;
>      MemStatus *devs;
> +    bool hw_reduced_acpi; /*true for hw reduced acpi platform */
>  } MemHotplugState;
>  
>  void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
> -                              MemHotplugState *state, uint16_t io_base);
> +                              MemHotplugState *state, hwaddr io_base);
>  
>  void acpi_memory_plug_cb(HotplugHandler *hotplug_dev, MemHotplugState *mem_st,
>                           DeviceState *dev, Error **errp);
> @@ -48,5 +49,6 @@ void acpi_memory_ospm_status(MemHotplugState *mem_st, ACPIOSTInfoList ***list);
>  
>  void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
>                                const char *res_root,
> -                              const char *event_handler_method);
> +                              const char *event_handler_method,
> +                              AmlRegionSpace rs);
>  #endif