Re: [PATCH v11 01/11] hw/fsi: Introduce IBM's Local bus

[Cédric Le Goater]

On 1/26/24 04:40, Ninad Palsule wrote:
> This is a part of patchset where IBM's Flexible Service Interface is
> introduced.
>
> The LBUS is modelled to maintain mapped memory for the devices. The
> memory is mapped after CFAM config, peek table and FSI slave registers.
>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> [ clg: - removed lbus_add_device() bc unused
>         - removed lbus_create_device() bc used only once
>         - removed "address" property
>         - updated meson.build to build fsi dir
>         - included an empty hw/fsi/trace-events ]
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>


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

Thanks,

C.


> ---
> v9:
>    - Changed LBUS memory region to 1MB.
> v11:
>    - Split lbus and scratchpad into separate patches.
>    - Added fsi_ prefix for all functions in lbus.
>    - Removed FSI_LBUS* typedefs.
>    - Replaced for loop with memset.
> ---
>   meson.build           |  1 +
>   hw/fsi/trace.h        |  1 +
>   include/hw/fsi/lbus.h | 32 ++++++++++++++++++++++++++++++++
>   hw/fsi/lbus.c         | 43 +++++++++++++++++++++++++++++++++++++++++++
>   hw/Kconfig            |  1 +
>   hw/fsi/Kconfig        |  2 ++
>   hw/fsi/meson.build    |  1 +
>   hw/fsi/trace-events   |  0
>   hw/meson.build        |  1 +
>   9 files changed, 82 insertions(+)
>   create mode 100644 hw/fsi/trace.h
>   create mode 100644 include/hw/fsi/lbus.h
>   create mode 100644 hw/fsi/lbus.c
>   create mode 100644 hw/fsi/Kconfig
>   create mode 100644 hw/fsi/meson.build
>   create mode 100644 hw/fsi/trace-events
>
> diff --git a/meson.build b/meson.build
> index d0329966f1..7d926c6e82 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -3290,6 +3290,7 @@ if have_system
>       'hw/char',
>       'hw/display',
>       'hw/dma',
> +    'hw/fsi',
>       'hw/hyperv',
>       'hw/i2c',
>       'hw/i386',
> diff --git a/hw/fsi/trace.h b/hw/fsi/trace.h
> new file mode 100644
> index 0000000000..ee67c7fb04
> --- /dev/null
> +++ b/hw/fsi/trace.h
> @@ -0,0 +1 @@
> +#include "trace/trace-hw_fsi.h"
> diff --git a/include/hw/fsi/lbus.h b/include/hw/fsi/lbus.h
> new file mode 100644
> index 0000000000..e8a22e22a8
> --- /dev/null
> +++ b/include/hw/fsi/lbus.h
> @@ -0,0 +1,32 @@
> +/*
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + * Copyright (C) 2024 IBM Corp.
> + *
> + * IBM Local bus and connected device structures.
> + */
> +#ifndef FSI_LBUS_H
> +#define FSI_LBUS_H
> +
> +#include "hw/qdev-core.h"
> +#include "qemu/units.h"
> +#include "exec/memory.h"
> +
> +#define TYPE_FSI_LBUS_DEVICE "fsi.lbus.device"
> +OBJECT_DECLARE_SIMPLE_TYPE(FSILBusDevice, FSI_LBUS_DEVICE)
> +
> +typedef struct FSILBusDevice {
> +    DeviceState parent;
> +
> +    MemoryRegion iomem;
> +} FSILBusDevice;
> +
> +#define TYPE_FSI_LBUS "fsi.lbus"
> +OBJECT_DECLARE_SIMPLE_TYPE(FSILBus, FSI_LBUS)
> +
> +typedef struct FSILBus {
> +    BusState bus;
> +
> +    MemoryRegion mr;
> +} FSILBus;
> +
> +#endif /* FSI_LBUS_H */
> diff --git a/hw/fsi/lbus.c b/hw/fsi/lbus.c
> new file mode 100644
> index 0000000000..44d2319087
> --- /dev/null
> +++ b/hw/fsi/lbus.c
> @@ -0,0 +1,43 @@
> +/*
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + * Copyright (C) 2024 IBM Corp.
> + *
> + * IBM Local bus where FSI slaves are connected
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "hw/fsi/lbus.h"
> +
> +#include "hw/qdev-properties.h"
> +
> +#include "trace.h"
> +
> +static void fsi_lbus_init(Object *o)
> +{
> +    FSILBus *lbus = FSI_LBUS(o);
> +
> +    memory_region_init(&lbus->mr, OBJECT(lbus), TYPE_FSI_LBUS, 1 * MiB);
> +}
> +
> +static const TypeInfo fsi_lbus_info = {
> +    .name = TYPE_FSI_LBUS,
> +    .parent = TYPE_BUS,
> +    .instance_init = fsi_lbus_init,
> +    .instance_size = sizeof(FSILBus),
> +};
> +
> +static const TypeInfo fsi_lbus_device_type_info = {
> +    .name = TYPE_FSI_LBUS_DEVICE,
> +    .parent = TYPE_DEVICE,
> +    .instance_size = sizeof(FSILBusDevice),
> +    .abstract = true,
> +};
> +
> +static void fsi_lbus_register_types(void)
> +{
> +    type_register_static(&fsi_lbus_info);
> +    type_register_static(&fsi_lbus_device_type_info);
> +}
> +
> +type_init(fsi_lbus_register_types);
> diff --git a/hw/Kconfig b/hw/Kconfig
> index 9ca7b38c31..2c00936c28 100644
> --- a/hw/Kconfig
> +++ b/hw/Kconfig
> @@ -9,6 +9,7 @@ source core/Kconfig
>   source cxl/Kconfig
>   source display/Kconfig
>   source dma/Kconfig
> +source fsi/Kconfig
>   source gpio/Kconfig
>   source hyperv/Kconfig
>   source i2c/Kconfig
> diff --git a/hw/fsi/Kconfig b/hw/fsi/Kconfig
> new file mode 100644
> index 0000000000..9c34a418d7
> --- /dev/null
> +++ b/hw/fsi/Kconfig
> @@ -0,0 +1,2 @@
> +config FSI
> +    bool
> diff --git a/hw/fsi/meson.build b/hw/fsi/meson.build
> new file mode 100644
> index 0000000000..93ba19dd04
> --- /dev/null
> +++ b/hw/fsi/meson.build
> @@ -0,0 +1 @@
> +system_ss.add(when: 'CONFIG_FSI', if_true: files('lbus.c'))
> diff --git a/hw/fsi/trace-events b/hw/fsi/trace-events
> new file mode 100644
> index 0000000000..e69de29bb2
> diff --git a/hw/meson.build b/hw/meson.build
> index f01fac4617..463d702683 100644
> --- a/hw/meson.build
> +++ b/hw/meson.build
> @@ -44,6 +44,7 @@ subdir('virtio')
>   subdir('watchdog')
>   subdir('xen')
>   subdir('xenpv')
> +subdir('fsi')
>   
>   subdir('alpha')
>   subdir('arm')