[v7,2/3] hw/ppc: Add N1 chiplet model

The N1 chiplet handle the high speed i/o traffic over PCIe and others.
The N1 chiplet consists of PowerBus Fabric controller,
nest Memory Management Unit, chiplet control unit and more.

This commit creates a N1 chiplet model and initialize and realize the
pervasive chiplet model where chiplet control registers are implemented.

This commit also implement the read/write method for the powerbus scom
registers

Signed-off-by: Chalapathi V <chalapathi.v@linux.ibm.com>
---
 include/hw/ppc/pnv_n1_chiplet.h |  33 ++++++
 include/hw/ppc/pnv_xscom.h      |   6 ++
 hw/ppc/pnv_n1_chiplet.c         | 173 ++++++++++++++++++++++++++++++++
 hw/ppc/meson.build              |   1 +
 4 files changed, 213 insertions(+)
 create mode 100644 include/hw/ppc/pnv_n1_chiplet.h
 create mode 100644 hw/ppc/pnv_n1_chiplet.c

On 12/7/23 03:43, Chalapathi V wrote:
> The N1 chiplet handle the high speed i/o traffic over PCIe and others.
> The N1 chiplet consists of PowerBus Fabric controller,
> nest Memory Management Unit, chiplet control unit and more.
> 
> This commit creates a N1 chiplet model and initialize and realize the
> pervasive chiplet model where chiplet control registers are implemented.
> 
> This commit also implement the read/write method for the powerbus scom
> registers
> 
> Signed-off-by: Chalapathi V <chalapathi.v@linux.ibm.com>


Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.


> ---
>   include/hw/ppc/pnv_n1_chiplet.h |  33 ++++++
>   include/hw/ppc/pnv_xscom.h      |   6 ++
>   hw/ppc/pnv_n1_chiplet.c         | 173 ++++++++++++++++++++++++++++++++
>   hw/ppc/meson.build              |   1 +
>   4 files changed, 213 insertions(+)
>   create mode 100644 include/hw/ppc/pnv_n1_chiplet.h
>   create mode 100644 hw/ppc/pnv_n1_chiplet.c
> 
> diff --git a/include/hw/ppc/pnv_n1_chiplet.h b/include/hw/ppc/pnv_n1_chiplet.h
> new file mode 100644
> index 0000000000..d5177bebce
> --- /dev/null
> +++ b/include/hw/ppc/pnv_n1_chiplet.h
> @@ -0,0 +1,33 @@
> +/*
> + * QEMU PowerPC N1 chiplet model
> + *
> + * Copyright (c) 2023, IBM Corporation.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#ifndef PPC_PNV_N1_CHIPLET_H
> +#define PPC_PNV_N1_CHIPLET_H
> +
> +#include "hw/ppc/pnv_nest_pervasive.h"
> +
> +#define TYPE_PNV_N1_CHIPLET "pnv-N1-chiplet"
> +#define PNV_N1_CHIPLET(obj) OBJECT_CHECK(PnvN1Chiplet, (obj), TYPE_PNV_N1_CHIPLET)
> +
> +typedef struct PnvPbScom {
> +    uint64_t mode;
> +    uint64_t hp_mode2_curr;
> +} PnvPbScom;
> +
> +typedef struct PnvN1Chiplet {
> +    DeviceState parent;
> +    MemoryRegion xscom_pb_eq_mr;
> +    MemoryRegion xscom_pb_es_mr;
> +    /* common pervasive chiplet unit */
> +    PnvNestChipletPervasive nest_pervasive;
> +#define PB_SCOM_EQ_SIZE 8
> +    PnvPbScom eq[PB_SCOM_EQ_SIZE];
> +#define PB_SCOM_ES_SIZE 4
> +    PnvPbScom es[PB_SCOM_ES_SIZE];

I prefer public definitions to have a PNV_ prefix. With that,

Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.


> +} PnvN1Chiplet;
> +#endif /*PPC_PNV_N1_CHIPLET_H */
> diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
> index 3e15706dec..535ae1dab0 100644
> --- a/include/hw/ppc/pnv_xscom.h
> +++ b/include/hw/ppc/pnv_xscom.h
> @@ -173,6 +173,12 @@ struct PnvXScomInterfaceClass {
>   #define PNV10_XSCOM_N1_CHIPLET_CTRL_REGS_BASE      0x3000000
>   #define PNV10_XSCOM_CHIPLET_CTRL_REGS_SIZE         0x400
>   
> +#define PNV10_XSCOM_N1_PB_SCOM_EQ_BASE      0x3011000
> +#define PNV10_XSCOM_N1_PB_SCOM_EQ_SIZE      0x200
> +
> +#define PNV10_XSCOM_N1_PB_SCOM_ES_BASE      0x3011300
> +#define PNV10_XSCOM_N1_PB_SCOM_ES_SIZE      0x100
> +
>   #define PNV10_XSCOM_PEC_NEST_BASE  0x3011800 /* index goes downwards ... */
>   #define PNV10_XSCOM_PEC_NEST_SIZE  0x100
>   
> diff --git a/hw/ppc/pnv_n1_chiplet.c b/hw/ppc/pnv_n1_chiplet.c
> new file mode 100644
> index 0000000000..03ff9fbad0
> --- /dev/null
> +++ b/hw/ppc/pnv_n1_chiplet.c
> @@ -0,0 +1,173 @@
> +/*
> + * QEMU PowerPC N1 chiplet model
> + *
> + * Copyright (c) 2023, IBM Corporation.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/log.h"
> +#include "hw/qdev-properties.h"
> +#include "hw/ppc/pnv.h"
> +#include "hw/ppc/pnv_xscom.h"
> +#include "hw/ppc/pnv_n1_chiplet.h"
> +#include "hw/ppc/pnv_nest_pervasive.h"
> +
> +/*
> + * The n1 chiplet contains chiplet control unit,
> + * PowerBus/RaceTrack/Bridge logic, nest Memory Management Unit(nMMU)
> + * and more.
> + *
> + * In this model Nest1 chiplet control registers are modelled via common
> + * nest pervasive model and few PowerBus racetrack registers are modelled.
> + */
> +
> +#define PB_SCOM_EQ0_HP_MODE2_CURR      0xe
> +#define PB_SCOM_ES3_MODE               0x8a
> +
> +static uint64_t pnv_n1_chiplet_pb_scom_eq_read(void *opaque, hwaddr addr,
> +                                                  unsigned size)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(opaque);
> +    uint32_t reg = addr >> 3;
> +    uint64_t val = ~0ull;
> +
> +    switch (reg) {
> +    case PB_SCOM_EQ0_HP_MODE2_CURR:
> +        val = n1_chiplet->eq[0].hp_mode2_curr;
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "%s: Invalid xscom read at 0x%" PRIx32 "\n",
> +                      __func__, reg);
> +    }
> +    return val;
> +}
> +
> +static void pnv_n1_chiplet_pb_scom_eq_write(void *opaque, hwaddr addr,
> +                                               uint64_t val, unsigned size)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(opaque);
> +    uint32_t reg = addr >> 3;
> +
> +    switch (reg) {
> +    case PB_SCOM_EQ0_HP_MODE2_CURR:
> +        n1_chiplet->eq[0].hp_mode2_curr = val;
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "%s: Invalid xscom write at 0x%" PRIx32 "\n",
> +                      __func__, reg);
> +    }
> +}
> +
> +static const MemoryRegionOps pnv_n1_chiplet_pb_scom_eq_ops = {
> +    .read = pnv_n1_chiplet_pb_scom_eq_read,
> +    .write = pnv_n1_chiplet_pb_scom_eq_write,
> +    .valid.min_access_size = 8,
> +    .valid.max_access_size = 8,
> +    .impl.min_access_size = 8,
> +    .impl.max_access_size = 8,
> +    .endianness = DEVICE_BIG_ENDIAN,
> +};
> +
> +static uint64_t pnv_n1_chiplet_pb_scom_es_read(void *opaque, hwaddr addr,
> +                                          unsigned size)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(opaque);
> +    uint32_t reg = addr >> 3;
> +    uint64_t val = ~0ull;
> +
> +    switch (reg) {
> +    case PB_SCOM_ES3_MODE:
> +        val = n1_chiplet->es[3].mode;
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "%s: Invalid xscom read at 0x%" PRIx32 "\n",
> +                      __func__, reg);
> +    }
> +    return val;
> +}
> +
> +static void pnv_n1_chiplet_pb_scom_es_write(void *opaque, hwaddr addr,
> +                                               uint64_t val, unsigned size)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(opaque);
> +    uint32_t reg = addr >> 3;
> +
> +    switch (reg) {
> +    case PB_SCOM_ES3_MODE:
> +        n1_chiplet->es[3].mode = val;
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "%s: Invalid xscom write at 0x%" PRIx32 "\n",
> +                      __func__, reg);
> +    }
> +}
> +
> +static const MemoryRegionOps pnv_n1_chiplet_pb_scom_es_ops = {
> +    .read = pnv_n1_chiplet_pb_scom_es_read,
> +    .write = pnv_n1_chiplet_pb_scom_es_write,
> +    .valid.min_access_size = 8,
> +    .valid.max_access_size = 8,
> +    .impl.min_access_size = 8,
> +    .impl.max_access_size = 8,
> +    .endianness = DEVICE_BIG_ENDIAN,
> +};
> +
> +static void pnv_n1_chiplet_realize(DeviceState *dev, Error **errp)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(dev);
> +
> +    /* Realize nest pervasive common chiplet model */
> +    if (!qdev_realize(DEVICE(&n1_chiplet->nest_pervasive), NULL, errp)) {
> +        return;
> +    }
> +
> +    /* Nest1 chiplet power bus EQ xscom region */
> +    pnv_xscom_region_init(&n1_chiplet->xscom_pb_eq_mr, OBJECT(n1_chiplet),
> +                          &pnv_n1_chiplet_pb_scom_eq_ops, n1_chiplet,
> +                          "xscom-n1-chiplet-pb-scom-eq",
> +                          PNV10_XSCOM_N1_PB_SCOM_EQ_SIZE);
> +
> +    /* Nest1 chiplet power bus ES xscom region */
> +    pnv_xscom_region_init(&n1_chiplet->xscom_pb_es_mr, OBJECT(n1_chiplet),
> +                          &pnv_n1_chiplet_pb_scom_es_ops, n1_chiplet,
> +                          "xscom-n1-chiplet-pb-scom-es",
> +                          PNV10_XSCOM_N1_PB_SCOM_ES_SIZE);
> +}
> +
> +static void pnv_n1_chiplet_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->desc = "PowerNV n1 chiplet";
> +    dc->realize = pnv_n1_chiplet_realize;
> +}
> +
> +static void pnv_n1_chiplet_instance_init(Object *obj)
> +{
> +    PnvN1Chiplet *n1_chiplet = PNV_N1_CHIPLET(obj);
> +
> +    object_initialize_child(OBJECT(n1_chiplet), "nest-pervasive-common",
> +                            &n1_chiplet->nest_pervasive,
> +                            TYPE_PNV_NEST_CHIPLET_PERVASIVE);
> +}
> +
> +static const TypeInfo pnv_n1_chiplet_info = {
> +    .name          = TYPE_PNV_N1_CHIPLET,
> +    .parent        = TYPE_DEVICE,
> +    .instance_init = pnv_n1_chiplet_instance_init,
> +    .instance_size = sizeof(PnvN1Chiplet),
> +    .class_init    = pnv_n1_chiplet_class_init,
> +    .interfaces    = (InterfaceInfo[]) {
> +        { TYPE_PNV_XSCOM_INTERFACE },
> +        { }
> +    }
> +};
> +
> +static void pnv_n1_chiplet_register_types(void)
> +{
> +    type_register_static(&pnv_n1_chiplet_info);
> +}
> +
> +type_init(pnv_n1_chiplet_register_types);
> diff --git a/hw/ppc/meson.build b/hw/ppc/meson.build
> index d6f6f94fcc..256e453c0c 100644
> --- a/hw/ppc/meson.build
> +++ b/hw/ppc/meson.build
> @@ -52,6 +52,7 @@ ppc_ss.add(when: 'CONFIG_POWERNV', if_true: files(
>     'pnv_homer.c',
>     'pnv_pnor.c',
>     'pnv_nest_pervasive.c',
> +  'pnv_n1_chiplet.c',
>   ))
>   # PowerPC 4xx boards
>   ppc_ss.add(when: 'CONFIG_PPC405', if_true: files(