Re: [Qemu-devel] [RFC PATCH 01/12] hw/tricore: Add testdevice for tests in tests/tcg/

["Alex Bennée" <alex.bennee@linaro.org>]

Bastian Koppelmann <kbastian@mail.uni-paderborn.de> writes:

> this device is used to verify the correctness of regression tests by
> allowing guests to write their exit status to this device. This is then
> used by qemu to exit using the written status.

My initial thoughts are this replicates the functionality of
virtio-console for chr-testdev used by kvm-unit-tests
(chardev/testdev.c). But on closer inspection it seems this is a
per-arch thing anyway.

>
> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  hw/tricore/Makefile.objs                |  1 +
>  hw/tricore/tricore_testboard.c          |  8 ++++
>  hw/tricore/tricore_testdevice.c         | 81 +++++++++++++++++++++++++++++++++
>  include/hw/tricore/tricore_testdevice.h | 38 ++++++++++++++++
>  4 files changed, 128 insertions(+)
>  create mode 100644 hw/tricore/tricore_testdevice.c
>  create mode 100644 include/hw/tricore/tricore_testdevice.h
>
> diff --git a/hw/tricore/Makefile.objs b/hw/tricore/Makefile.objs
> index 435e095cff..9e871a01e2 100644
> --- a/hw/tricore/Makefile.objs
> +++ b/hw/tricore/Makefile.objs
> @@ -1 +1,2 @@
>  obj-y += tricore_testboard.o
> +obj-y += tricore_testdevice.o
> diff --git a/hw/tricore/tricore_testboard.c b/hw/tricore/tricore_testboard.c
> index 8e61dfc3e6..ee0a332e12 100644
> --- a/hw/tricore/tricore_testboard.c
> +++ b/hw/tricore/tricore_testboard.c
> @@ -31,6 +31,7 @@
>  #include "exec/address-spaces.h"
>  #include "elf.h"
>  #include "hw/tricore/tricore.h"
> +#include "hw/tricore/tricore_testdevice.h"
>  #include "qemu/error-report.h"
>
>
> @@ -60,6 +61,7 @@ static void tricore_testboard_init(MachineState *machine, int board_id)
>  {
>      TriCoreCPU *cpu;
>      CPUTriCoreState *env;
> +    TriCoreTestDeviceState *test_dev;
>
>      MemoryRegion *sysmem = get_system_memory();
>      MemoryRegion *ext_cram = g_new(MemoryRegion, 1);
> @@ -91,6 +93,12 @@ static void tricore_testboard_init(MachineState *machine, int board_id)
>      memory_region_add_subregion(sysmem, 0xf0050000, pcp_data);
>      memory_region_add_subregion(sysmem, 0xf0060000, pcp_text);
>
> +    /* test device */
> +    test_dev = g_new(TriCoreTestDeviceState, 1);
> +    object_initialize(test_dev, sizeof(TriCoreTestDeviceState),
> +                      TYPE_TRICORE_TESTDEVICE);
> +    memory_region_add_subregion(sysmem, 0xf0000000, &test_dev->iomem);
> +
>      tricoretb_binfo.ram_size = machine->ram_size;
>      tricoretb_binfo.kernel_filename = machine->kernel_filename;
>
> diff --git a/hw/tricore/tricore_testdevice.c b/hw/tricore/tricore_testdevice.c
> new file mode 100644
> index 0000000000..ce4c67fcae
> --- /dev/null
> +++ b/hw/tricore/tricore_testdevice.c
> @@ -0,0 +1,81 @@
> +/*
> + *  Copyright (c) 2018 Bastian Koppelmann Paderborn University
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "hw/sysbus.h"
> +#include "hw/tricore/tricore_testdevice.h"
> +
> +static void tricore_testdevice_write(void *opaque, hwaddr offset,
> +                                      uint64_t value, unsigned size)
> +{
> +    exit(value);
> +}
> +
> +static uint64_t tricore_testdevice_read(void *opaque, hwaddr offset,
> +                                         unsigned size)
> +{
> +    return 0xdeadbeef;
> +}
> +
> +static void tricore_testdevice_reset(DeviceState *dev)
> +{
> +}
> +
> +static const MemoryRegionOps tricore_testdevice_ops = {
> +    .read = tricore_testdevice_read,
> +    .write = tricore_testdevice_write,
> +    .valid = {
> +        .min_access_size = 4,
> +        .max_access_size = 4,
> +    },
> +    .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static void tricore_testdevice_init(Object *obj)
> +{
> +    TriCoreTestDeviceState *s = TRICORE_TESTDEVICE(obj);
> +   /* map memory */
> +    memory_region_init_io(&s->iomem, OBJECT(s), &tricore_testdevice_ops, s,
> +                          "tricore_testdevice", 0x4);
> +}
> +
> +static Property tricore_testdevice_properties[] = {
> +    DEFINE_PROP_END_OF_LIST()
> +};
> +
> +static void tricore_testdevice_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->props = tricore_testdevice_properties;
> +    dc->reset = tricore_testdevice_reset;
> +}
> +
> +static const TypeInfo tricore_testdevice_info = {
> +    .name          = TYPE_TRICORE_TESTDEVICE,
> +    .parent        = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(TriCoreTestDeviceState),
> +    .instance_init = tricore_testdevice_init,
> +    .class_init    = tricore_testdevice_class_init,
> +};
> +
> +static void tricore_testdevice_register_types(void)
> +{
> +    type_register_static(&tricore_testdevice_info);
> +}
> +
> +type_init(tricore_testdevice_register_types)
> diff --git a/include/hw/tricore/tricore_testdevice.h b/include/hw/tricore/tricore_testdevice.h
> new file mode 100644
> index 0000000000..5b2df219e3
> --- /dev/null
> +++ b/include/hw/tricore/tricore_testdevice.h
> @@ -0,0 +1,38 @@
> +/*
> + *  Copyright (c) 2018  Bastian Koppelmann Paderborn University
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +
> +#ifndef HW_TRICORE_TESTDEV_H
> +#define HW_TRICORE_TESTDEV_H
> +
> +#include "hw/sysbus.h"
> +#include "hw/hw.h"
> +
> +#define TYPE_TRICORE_TESTDEVICE "tricore_testdevice"
> +#define TRICORE_TESTDEVICE(obj) \
> +    OBJECT_CHECK(TriCoreTestDeviceState, (obj), TYPE_TRICORE_TESTDEVICE)
> +
> +typedef struct {
> +    /* <private> */
> +    SysBusDevice parent_obj;
> +
> +    /* <public> */
> +    MemoryRegion iomem;
> +
> +} TriCoreTestDeviceState;
> +
> +#endif


--
Alex Bennée