Re: [Qemu-devel] [PATCH 8/9] hw/sparc/sun4m: Simplify the RAM creation

[Artyom Tarasenko <atar4qemu@gmail.com>]

On Tue, Jun 25, 2019 at 12:01 AM Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> Now than the empty_slot device can be overlapped, use it to cover
> the maximum memory range.

Whilie this is true for SS-5, the SS-20 does trap on missing RAM, so
empty_slot_init must be conditional.
nack.

> We can simplify now the main RAM is created.
> The TYPE_SUN4M_MEMORY is not migratable, simply remove it.
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  hw/sparc/sun4m.c | 85 ++++++++----------------------------------------
>  1 file changed, 13 insertions(+), 72 deletions(-)
>
> diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
> index 0df5a8edfc..d55753d5cb 100644
> --- a/hw/sparc/sun4m.c
> +++ b/hw/sparc/sun4m.c
> @@ -767,71 +767,6 @@ static const TypeInfo prom_info = {
>      .class_init    = prom_class_init,
>  };
>
> -#define TYPE_SUN4M_MEMORY "memory"
> -#define SUN4M_RAM(obj) OBJECT_CHECK(RamDevice, (obj), TYPE_SUN4M_MEMORY)
> -
> -typedef struct RamDevice {
> -    SysBusDevice parent_obj;
> -
> -    MemoryRegion ram;
> -    uint64_t size;
> -} RamDevice;
> -
> -/* System RAM */
> -static void ram_realize(DeviceState *dev, Error **errp)
> -{
> -    RamDevice *d = SUN4M_RAM(dev);
> -    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
> -
> -    memory_region_allocate_system_memory(&d->ram, OBJECT(d), "sun4m.ram",
> -                                         d->size);
> -    sysbus_init_mmio(sbd, &d->ram);
> -}
> -
> -static void ram_init(hwaddr addr, ram_addr_t RAM_size,
> -                     uint64_t max_mem)
> -{
> -    DeviceState *dev;
> -    SysBusDevice *s;
> -    RamDevice *d;
> -
> -    /* allocate RAM */
> -    if ((uint64_t)RAM_size > max_mem) {
> -        error_report("Too much memory for this machine: %" PRId64 ","
> -                     " maximum %" PRId64,
> -                     RAM_size / MiB, max_mem / MiB);
> -        exit(1);
> -    }
> -    dev = qdev_create(NULL, "memory");
> -    s = SYS_BUS_DEVICE(dev);
> -
> -    d = SUN4M_RAM(dev);
> -    d->size = RAM_size;
> -    qdev_init_nofail(dev);
> -
> -    sysbus_mmio_map(s, 0, addr);
> -}
> -
> -static Property ram_properties[] = {
> -    DEFINE_PROP_UINT64("size", RamDevice, size, 0),
> -    DEFINE_PROP_END_OF_LIST(),
> -};
> -
> -static void ram_class_init(ObjectClass *klass, void *data)
> -{
> -    DeviceClass *dc = DEVICE_CLASS(klass);
> -
> -    dc->realize = ram_realize;
> -    dc->props = ram_properties;
> -}
> -
> -static const TypeInfo ram_info = {
> -    .name          = TYPE_SUN4M_MEMORY,
> -    .parent        = TYPE_SYS_BUS_DEVICE,
> -    .instance_size = sizeof(RamDevice),
> -    .class_init    = ram_class_init,
> -};
> -
>  static void cpu_devinit(const char *cpu_type, unsigned int id,
>                          uint64_t prom_addr, qemu_irq **cpu_irqs)
>  {
> @@ -872,6 +807,19 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef,
>      FWCfgState *fw_cfg;
>      DeviceState *dev;
>      SysBusDevice *s;
> +    MemoryRegion ram;
> +
> +    if ((uint64_t)machine->ram_size > hwdef->max_mem) {
> +        error_report("Too much memory for this machine: %" PRId64 ","
> +                     " maximum %" PRId64,
> +                     machine->ram_size / MiB, hwdef->max_mem / MiB);
> +        exit(1);
> +    }
> +    memory_region_allocate_system_memory(&ram, OBJECT(machine), "sun4m.ram",
> +                                         machine->ram_size);
> +    memory_region_add_subregion(get_system_memory(), 0x00000000, &ram);
> +    /* models without ECC don't trap when missing ram is accessed */
> +    empty_slot_init(0x00000000, hwdef->max_mem);
>
>      /* init CPUs */
>      for(i = 0; i < smp_cpus; i++) {
> @@ -881,13 +829,7 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef,
>      for (i = smp_cpus; i < MAX_CPUS; i++)
>          cpu_irqs[i] = qemu_allocate_irqs(dummy_cpu_set_irq, NULL, MAX_PILS);
>
> -
>      /* set up devices */
> -    ram_init(0, machine->ram_size, hwdef->max_mem);
> -    /* models without ECC don't trap when missing ram is accessed */
> -    if (!hwdef->ecc_base) {
> -        empty_slot_init(machine->ram_size, hwdef->max_mem - machine->ram_size);
> -    }
>
>      prom_init(hwdef->slavio_base, bios_name);
>
> @@ -1561,7 +1503,6 @@ static void sun4m_register_types(void)
>      type_register_static(&idreg_info);
>      type_register_static(&afx_info);
>      type_register_static(&prom_info);
> -    type_register_static(&ram_info);
>
>      type_register_static(&ss5_type);
>      type_register_static(&ss10_type);
> --
> 2.19.1
>


-- 
Regards,
Artyom Tarasenko

SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu