Re: [PATCH v2 4/5] aspeed/smc: Use a container for the flash mmio address space

[Francisco Iglesias <frasse.iglesias@gmail.com>]

On [2021 Oct 18] Mon 15:26:08, Cédric Le Goater wrote:
> Because AddressSpaces must not be sysbus-mapped, commit e9c568dbc225
> ("hw/arm/aspeed: Do not sysbus-map mmio flash region directly, use
> alias") introduced an alias for the flash mmio region.
> 
> Using a container is cleaner.
> 
> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>

> ---
>  include/hw/ssi/aspeed_smc.h |  2 +-
>  hw/ssi/aspeed_smc.c         | 11 +++++++----
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/include/hw/ssi/aspeed_smc.h b/include/hw/ssi/aspeed_smc.h
> index ad3c80f2d809..61d23ec1f13e 100644
> --- a/include/hw/ssi/aspeed_smc.h
> +++ b/include/hw/ssi/aspeed_smc.h
> @@ -52,8 +52,8 @@ struct AspeedSMCState {
>      SysBusDevice parent_obj;
>  
>      MemoryRegion mmio;
> +    MemoryRegion mmio_flash_container;
>      MemoryRegion mmio_flash;
> -    MemoryRegion mmio_flash_alias;
>  
>      qemu_irq irq;
>  
> diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
> index 1770985230b0..d4f03881ddf5 100644
> --- a/hw/ssi/aspeed_smc.c
> +++ b/hw/ssi/aspeed_smc.c
> @@ -1218,14 +1218,17 @@ static void aspeed_smc_realize(DeviceState *dev, Error **errp)
>       * window in which the flash modules are mapped. The size and
>       * address depends on the SoC model and controller type.
>       */
> +    memory_region_init(&s->mmio_flash_container, OBJECT(s),
> +                       TYPE_ASPEED_SMC ".container",
> +                       asc->flash_window_size);
> +    sysbus_init_mmio(sbd, &s->mmio_flash_container);
> +
>      memory_region_init_io(&s->mmio_flash, OBJECT(s),
>                            &aspeed_smc_flash_default_ops, s,
>                            TYPE_ASPEED_SMC ".flash",
>                            asc->flash_window_size);
> -    memory_region_init_alias(&s->mmio_flash_alias, OBJECT(s),
> -                             TYPE_ASPEED_SMC ".flash",
> -                             &s->mmio_flash, 0, asc->flash_window_size);
> -    sysbus_init_mmio(sbd, &s->mmio_flash_alias);
> +    memory_region_add_subregion(&s->mmio_flash_container, 0x0,
> +                                &s->mmio_flash);
>  
>      /*
>       * Let's create a sub memory region for each possible peripheral. All
> -- 
> 2.31.1
> 
>