Re: [Qemu-devel] [PATCH v2 12/21] RISC-V HART Array

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 10 Jan 2018 15:46:31 -0800
Michael Clark <mjc@sifive.com> wrote:

> Holds the state of a heterogenous array of RISC-V hardware threads.
> 
> Signed-off-by: Michael Clark <mjc@sifive.com>
> ---
>  hw/riscv/riscv_hart.c         | 95 +++++++++++++++++++++++++++++++++++++++++++
>  include/hw/riscv/riscv_hart.h | 45 ++++++++++++++++++++
>  2 files changed, 140 insertions(+)
>  create mode 100644 hw/riscv/riscv_hart.c
>  create mode 100644 include/hw/riscv/riscv_hart.h
> 
> diff --git a/hw/riscv/riscv_hart.c b/hw/riscv/riscv_hart.c
> new file mode 100644
> index 0000000..a7e079e
> --- /dev/null
> +++ b/hw/riscv/riscv_hart.c
> @@ -0,0 +1,95 @@
> +/*
> + * QEMU RISCV Hart Array
> + *
> + * Copyright (c) 2017 SiFive, Inc.
> + *
> + * Holds the state of a heterogenous array of RISC-V harts
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "hw/sysbus.h"
> +#include "target/riscv/cpu.h"
> +#include "hw/riscv/riscv_hart.h"
> +
> +static Property riscv_harts_props[] = {
> +    DEFINE_PROP_UINT32("num-harts", RISCVHartArrayState, num_harts, 1),
> +    DEFINE_PROP_STRING("cpu-model", RISCVHartArrayState, cpu_model),
suggest to rename it to cpu-type/cpu_type since it's used as such,
new code shouldn't use cpu_model anywhere except of foo_cpu_class_by_name()
callback.

> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void riscv_harts_cpu_reset(void *opaque)
> +{
> +    RISCVCPU *cpu = opaque;
> +    cpu_reset(CPU(cpu));
> +}
> +
> +static void riscv_harts_realize(DeviceState *dev, Error **errp)
> +{
> +    RISCVHartArrayState *s = RISCV_HART_ARRAY(dev);
> +    Error *err = NULL;
> +    int n;
> +
> +    s->harts = g_new0(RISCVCPU, s->num_harts);
> +
> +    for (n = 0; n < s->num_harts; n++) {
> +
> +        object_initialize(&s->harts[n], sizeof(RISCVCPU), s->cpu_model);
> +        s->harts[n].env.mhartid = n;
> +        object_property_add_child(OBJECT(s), "harts[*]", OBJECT(&s->harts[n]),
> +                                  &error_abort);
> +        qemu_register_reset(riscv_harts_cpu_reset, &s->harts[n]);
> +        object_property_set_bool(OBJECT(&s->harts[n]), true,
> +                                 "realized", &err);
> +        if (err) {
> +            error_propagate(errp, err);
> +            return;
> +        }
> +    }
> +}
> +
> +static void riscv_harts_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->props = riscv_harts_props;
> +    dc->realize = riscv_harts_realize;
> +}
> +
> +static void riscv_harts_init(Object *obj)
> +{
> +    /* RISCVHartArrayState *s = SIFIVE_COREPLEX(obj); */
> +}
> +
> +static const TypeInfo riscv_harts_info = {
> +    .name          = TYPE_RISCV_HART_ARRAY,
> +    .parent        = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(RISCVHartArrayState),
> +    .instance_init = riscv_harts_init,
> +    .class_init    = riscv_harts_class_init,
> +};
> +
> +static void riscv_harts_register_types(void)
> +{
> +    type_register_static(&riscv_harts_info);
> +}
> +
> +type_init(riscv_harts_register_types)
> diff --git a/include/hw/riscv/riscv_hart.h b/include/hw/riscv/riscv_hart.h
> new file mode 100644
> index 0000000..c45e987
> --- /dev/null
> +++ b/include/hw/riscv/riscv_hart.h
> @@ -0,0 +1,45 @@
> +/*
> + * QEMU RISC-V Hart Array interface
> + *
> + * Copyright (c) 2017 SiFive, Inc.
> + *
> + * Holds the state of a heterogenous array of RISC-V harts
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#ifndef HW_RISCV_HART_H
> +#define HW_RISCV_HART_H
> +
> +#define TYPE_RISCV_HART_ARRAY "riscv.hart_array"
> +
> +#define RISCV_HART_ARRAY(obj) \
> +    OBJECT_CHECK(RISCVHartArrayState, (obj), TYPE_RISCV_HART_ARRAY)
> +
> +typedef struct RISCVHartArrayState {
> +    /*< private >*/
> +    SysBusDevice parent_obj;
> +
> +    /*< public >*/
> +    uint32_t num_harts;
> +    char *cpu_model;
> +    RISCVCPU *harts;
> +} RISCVHartArrayState;
> +
> +#endif