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Re: [Qemu-riscv] [Qemu-devel] [PATCH v7 15/30] riscv: hart: Add a "harti


From: Alistair Francis
Subject: Re: [Qemu-riscv] [Qemu-devel] [PATCH v7 15/30] riscv: hart: Add a "hartid-base" property to RISC-V hart array
Date: Tue, 3 Sep 2019 16:09:11 -0700

On Sat, Aug 31, 2019 at 7:58 PM Bin Meng <address@hidden> wrote:
>
> At present each hart's hartid in a RISC-V hart array is assigned
> the same value of its index in the hart array. But for a system
> that has multiple hart arrays, this is not the case any more.
>
> Add a new "hartid-base" property so that hartid number can be
> assigned based on the property value.
>
> Signed-off-by: Bin Meng <address@hidden>

Reviewed-by: Alistair Francis <address@hidden>

Alistair

>
> ---
>
> Changes in v7:
> - use `s->hartid_base + idx` directly
>
> Changes in v6:
> - use s->hartid_base directly, instead of an extra variable
>
> Changes in v5: None
> Changes in v4:
> - new patch to add a "hartid-base" property to RISC-V hart array
>
> Changes in v3: None
> Changes in v2: None
>
>  hw/riscv/riscv_hart.c         | 3 ++-
>  include/hw/riscv/riscv_hart.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/hw/riscv/riscv_hart.c b/hw/riscv/riscv_hart.c
> index 9deef869..e28db80 100644
> --- a/hw/riscv/riscv_hart.c
> +++ b/hw/riscv/riscv_hart.c
> @@ -27,6 +27,7 @@
>
>  static Property riscv_harts_props[] = {
>      DEFINE_PROP_UINT32("num-harts", RISCVHartArrayState, num_harts, 1),
> +    DEFINE_PROP_UINT32("hartid-base", RISCVHartArrayState, hartid_base, 0),
>      DEFINE_PROP_STRING("cpu-type", RISCVHartArrayState, cpu_type),
>      DEFINE_PROP_END_OF_LIST(),
>  };
> @@ -45,7 +46,7 @@ static void riscv_hart_realize(RISCVHartArrayState *s, int 
> idx,
>      object_initialize_child(OBJECT(s), "harts[*]", &s->harts[idx],
>                              sizeof(RISCVCPU), cpu_type,
>                              &error_abort, NULL);
> -    s->harts[idx].env.mhartid = idx;
> +    s->harts[idx].env.mhartid = s->hartid_base + idx;
>      qemu_register_reset(riscv_harts_cpu_reset, &s->harts[idx]);
>      object_property_set_bool(OBJECT(&s->harts[idx]), true,
>                               "realized", &err);
> diff --git a/include/hw/riscv/riscv_hart.h b/include/hw/riscv/riscv_hart.h
> index 0671d88..1984e30 100644
> --- a/include/hw/riscv/riscv_hart.h
> +++ b/include/hw/riscv/riscv_hart.h
> @@ -32,6 +32,7 @@ typedef struct RISCVHartArrayState {
>
>      /*< public >*/
>      uint32_t num_harts;
> +    uint32_t hartid_base;
>      char *cpu_type;
>      RISCVCPU *harts;
>  } RISCVHartArrayState;
> --
> 2.7.4
>
>



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