Re: [PATCH v3 23/33] dp8393x: replace PROP_PTR with PROP_LINK

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 10/23/19 7:31 PM, Marc-André Lureau wrote:
> Link property is the correct way to pass a MemoryRegion to a device
> for DMA purposes.
> 
> Sidenote: as a sysbus device, this remains non-usercreatable
> even though we can drop the specific flag here.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   hw/mips/mips_jazz.c | 3 ++-
>   hw/net/dp8393x.c    | 7 +++----
>   2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c
> index 8d010a0b6e..878925a963 100644
> --- a/hw/mips/mips_jazz.c
> +++ b/hw/mips/mips_jazz.c
> @@ -284,7 +284,8 @@ static void mips_jazz_init(MachineState *machine,
>               dev = qdev_create(NULL, "dp8393x");
>               qdev_set_nic_properties(dev, nd);
>               qdev_prop_set_uint8(dev, "it_shift", 2);
> -            qdev_prop_set_ptr(dev, "dma_mr", rc4030_dma_mr);
> +            object_property_set_link(OBJECT(dev), OBJECT(rc4030_dma_mr),
> +                                     "dma_mr", &error_abort);
>               qdev_init_nofail(dev);
>               sysbus = SYS_BUS_DEVICE(dev);
>               sysbus_mmio_map(sysbus, 0, 0x80001000);
> diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
> index a5678e11fa..946c7a8f64 100644
> --- a/hw/net/dp8393x.c
> +++ b/hw/net/dp8393x.c
> @@ -173,7 +173,7 @@ typedef struct dp8393xState {
>       int loopback_packet;
>   
>       /* Memory access */
> -    void *dma_mr;
> +    MemoryRegion *dma_mr;
>       AddressSpace as;
>   } dp8393xState;
>   
> @@ -922,7 +922,8 @@ static const VMStateDescription vmstate_dp8393x = {
>   
>   static Property dp8393x_properties[] = {
>       DEFINE_NIC_PROPERTIES(dp8393xState, conf),
> -    DEFINE_PROP_PTR("dma_mr", dp8393xState, dma_mr),
> +    DEFINE_PROP_LINK("dma_mr", dp8393xState, dma_mr,
> +                     TYPE_MEMORY_REGION, MemoryRegion *),
>       DEFINE_PROP_UINT8("it_shift", dp8393xState, it_shift, 0),
>       DEFINE_PROP_END_OF_LIST(),
>   };
> @@ -936,8 +937,6 @@ static void dp8393x_class_init(ObjectClass *klass, void *data)
>       dc->reset = dp8393x_reset;
>       dc->vmsd = &vmstate_dp8393x;
>       dc->props = dp8393x_properties;
> -    /* Reason: dma_mr property can't be set */
> -    dc->user_creatable = false;

Patch is OK except this user_creatable change I don't understand.

>   }
>   
>   static const TypeInfo dp8393x_info = {
>