Re: [Qemu-devel] [PATCH v6 08/11] target-ppc: Introduce PowerPC specific CPU core device

[Alexey Kardashevskiy]

On 01/08/2016 05:55 PM, Bharata B Rao wrote:
> CPU core device is a container of CPU thread devices.  CPU hotplug is
> performed at the granularity of CPU core device. When hotplugged, CPU core
> creates CPU thread devices.
>
> Signed-off-by: Bharata B Rao <address@hidden>
> ---
>   hw/ppc/Makefile.objs      |  1 +
>   hw/ppc/cpu-core.c         | 69 +++++++++++++++++++++++++++++++++++++++++++++++
>   include/hw/ppc/cpu-core.h | 22 +++++++++++++++
>   3 files changed, 92 insertions(+)
>   create mode 100644 hw/ppc/cpu-core.c
>   create mode 100644 include/hw/ppc/cpu-core.h
>
> diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
> index c1ffc77..a6b7cfb 100644
> --- a/hw/ppc/Makefile.objs
> +++ b/hw/ppc/Makefile.objs
> @@ -21,3 +21,4 @@ obj-$(CONFIG_E500) += e500.o mpc8544ds.o e500plat.o
>   obj-$(CONFIG_E500) += mpc8544_guts.o ppce500_spin.o
>   # PowerPC 440 Xilinx ML507 reference board.
>   obj-$(CONFIG_XILINX) += virtex_ml507.o
> +obj-y += cpu-core.o
> diff --git a/hw/ppc/cpu-core.c b/hw/ppc/cpu-core.c
> new file mode 100644
> index 0000000..c5c6188
> --- /dev/null
> +++ b/hw/ppc/cpu-core.c
> @@ -0,0 +1,69 @@
> +/*
> + * CPU core device, acts as container of CPU thread devices.
> + *
> + * Copyright (C) 2015 Bharata B Rao <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +#include "hw/ppc/cpu-core.h"
> +#include "hw/boards.h"
> +#include <sysemu/cpus.h>
> +#include "qemu/error-report.h"
> +
> +static int ppc_cpu_core_realize_child(Object *child, void *opaque)
> +{
> +    Error **errp = opaque;
> +
> +    object_property_set_bool(child, true, "realized", errp);
> +    if (*errp) {
> +        return 1;
> +    }
> +
> +    return 0;
> +}
> +
> +static void ppc_cpu_core_realize(DeviceState *dev, Error **errp)
> +{
> +    object_child_foreach(OBJECT(dev), ppc_cpu_core_realize_child, errp);
> +}
> +
> +static void ppc_cpu_core_class_init(ObjectClass *oc, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(oc);
> +
> +    dc->realize = ppc_cpu_core_realize;
> +}
> +
> +static void ppc_cpu_core_instance_init(Object *obj)
> +{
> +    int i;
> +    CPUState *cpu;
> +    MachineState *machine = MACHINE(qdev_get_machine());
> +
> +    /* Create as many CPU threads as specified in the topology */
> +    for (i = 0; i < smp_threads; i++) {
> +        cpu = cpu_generic_init(TYPE_POWERPC_CPU, machine->cpu_model);
> +        if (!cpu) {
> +            error_report("Unable to find CPU definition: %s\n",
> +                          machine->cpu_model);
> +            exit(EXIT_FAILURE);
> +        }
> +        object_property_add_child(obj, "thread[*]", OBJECT(cpu), &error_abort);
> +        object_unref(OBJECT(cpu));
> +    }
> +}
> +
> +static const TypeInfo ppc_cpu_core_type_info = {
> +    .name = TYPE_POWERPC_CPU_CORE,
> +    .parent = TYPE_DEVICE,
> +    .class_init = ppc_cpu_core_class_init,
> +    .instance_init = ppc_cpu_core_instance_init,


Out of curiosity - why not .realize (and return Error instead of exit())? 
I'd think this is the recommended approach now for QOM.



--
Alexey