Re: [Qemu-devel] [PATCH v5 2/6] qdev: introduce FWPathProvider interface

[Andreas Färber]

Am 20.02.2014 14:50, schrieb Alexey Kardashevskiy:
> QEMU supports firmware names for all devices in the QEMU tree but
> some architectures expect some parts of firmware path names in different
> format.
> 
> This introduces a firmware-pathname-change interface definition.
> If some machines needs to redefine the firmware path format, it has
> to add the TYPE_FW_PATH_PROVIDER interface to an object that is above
> the device on the QOM tree (typically /machine).
> 
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> Signed-off-by: Paolo Bonzini <address@hidden>

I do not see a reply to my question on v4 and didn't catch bonzini on
IRC - guessing the two lines should be swapped since both v4 and v5 were
submitted by Alexey?

> ---
> Changes:
> v5:
> * fixed code design
> * added license headers
> 
> v4:
> * added fw-path-provider.o into tests/Makefile
> * fixed 80chars warning from checkpatch.pl
> ---
>  hw/core/Makefile.objs         |  1 +
>  hw/core/fw-path-provider.c    | 51 
> +++++++++++++++++++++++++++++++++++++++++++
>  hw/core/qdev.c                | 18 ++++++++++++++-
>  include/hw/fw-path-provider.h | 49 +++++++++++++++++++++++++++++++++++++++++
>  tests/Makefile                |  1 +
>  5 files changed, 119 insertions(+), 1 deletion(-)
>  create mode 100644 hw/core/fw-path-provider.c
>  create mode 100644 include/hw/fw-path-provider.h
> 
> diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
> index 9e324be..9f75ea3 100644
> --- a/hw/core/Makefile.objs
> +++ b/hw/core/Makefile.objs
> @@ -1,5 +1,6 @@
>  # core qdev-related obj files, also used by *-user:
>  common-obj-y += qdev.o qdev-properties.o
> +common-obj-y += fw-path-provider.o
>  # irq.o needed for qdev GPIO handling:
>  common-obj-y += irq.o
>  common-obj-y += hotplug.o
> diff --git a/hw/core/fw-path-provider.c b/hw/core/fw-path-provider.c
> new file mode 100644
> index 0000000..b117157
> --- /dev/null
> +++ b/hw/core/fw-path-provider.c
> @@ -0,0 +1,51 @@
> +/*
> + *  Firmware patch provider class and helpers.
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; under version 2 of the License.
> + *
> + *  This program 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 General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "hw/fw-path-provider.h"
> +
> +char *fw_path_provider_get_dev_path(FWPathProvider *p, BusState *bus,
> +                                    DeviceState *dev)
> +{
> +    FWPathProviderClass *k = FW_PATH_PROVIDER_GET_CLASS(p);
> +
> +    return k->get_dev_path(p, bus, dev);
> +}
> +
> +char *fw_path_provider_try_get_dev_path(Object *o, BusState *bus,
> +                                        DeviceState *dev)
> +{
> +    FWPathProvider *p = (FWPathProvider *)
> +        object_dynamic_cast(o, TYPE_FW_PATH_PROVIDER);
> +
> +    if (p) {
> +        return fw_path_provider_get_dev_path(p, bus, dev);
> +    }
> +
> +    return NULL;
> +}
> +
> +static const TypeInfo fw_path_provider_info = {
> +    .name          = TYPE_FW_PATH_PROVIDER,
> +    .parent        = TYPE_INTERFACE,
> +    .class_size    = sizeof(FWPathProviderClass),
> +};
> +
> +static void fw_path_provider_register_types(void)
> +{
> +    type_register_static(&fw_path_provider_info);
> +}
> +
> +type_init(fw_path_provider_register_types)
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index ae30163..dd993b5 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -26,6 +26,7 @@
>     this API directly.  */
>  
>  #include "hw/qdev.h"
> +#include "hw/fw-path-provider.h"
>  #include "sysemu/sysemu.h"
>  #include "qapi/error.h"
>  #include "qapi/qmp/qerror.h"
> @@ -529,6 +530,18 @@ static char *bus_get_fw_dev_path(BusState *bus, 
> DeviceState *dev)
>      return NULL;
>  }
>  
> +static char *qdev_get_fw_dev_path_from_handler(BusState *bus, DeviceState 
> *dev)
> +{
> +    Object *obj = OBJECT(dev);
> +    char *d = NULL;
> +
> +    while (!d && obj->parent) {
> +        obj = obj->parent;
> +        d = fw_path_provider_try_get_dev_path(obj, bus, dev);
> +    }
> +    return d;
> +}
> +
>  static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
>  {
>      int l = 0;
> @@ -536,7 +549,10 @@ static int qdev_get_fw_dev_path_helper(DeviceState *dev, 
> char *p, int size)
>      if (dev && dev->parent_bus) {
>          char *d;
>          l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
> -        d = bus_get_fw_dev_path(dev->parent_bus, dev);
> +        d = qdev_get_fw_dev_path_from_handler(dev->parent_bus, dev);
> +        if (!d) {
> +            d = bus_get_fw_dev_path(dev->parent_bus, dev);
> +        }
>          if (d) {
>              l += snprintf(p + l, size - l, "%s", d);
>              g_free(d);
> diff --git a/include/hw/fw-path-provider.h b/include/hw/fw-path-provider.h
> new file mode 100644
> index 0000000..8889d8b
> --- /dev/null
> +++ b/include/hw/fw-path-provider.h
> @@ -0,0 +1,49 @@
> +/*
> + *  Firmware patch provider class and helpers definitions.
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; under version 2 of the License.
> + *
> + *  This program 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 General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef FW_PATH_PROVIDER_H
> +#define FW_PATH_PROVIDER_H 1
> +
> +#include "qemu-common.h"
> +#include "qom/object.h"
> +
> +#define TYPE_FW_PATH_PROVIDER "fw-path-provider"
> +
> +#define FW_PATH_PROVIDER_CLASS(klass) \
> +     OBJECT_CLASS_CHECK(FWPathProviderClass, (klass), TYPE_FW_PATH_PROVIDER)
> +#define FW_PATH_PROVIDER_GET_CLASS(obj) \
> +    OBJECT_GET_CLASS(FWPathProviderClass, (obj), TYPE_FW_PATH_PROVIDER)
> +#define FW_PATH_PROVIDER(obj) \
> +     INTERFACE_CHECK(FWPathProvider, (obj), TYPE_FW_PATH_PROVIDER)
> +
> +typedef struct FWPathProvider {
> +    Object parent_obj;
> +} FWPathProvider;

Unused?

> +
> +typedef void (*StreamCanPushNotifyFn)(void *opaque);

Unused?

Hoping we can consider this a bugfix and get done during freeze.

Andreas

> +
> +typedef struct FWPathProviderClass {
> +    InterfaceClass parent_class;
> +
> +    char *(*get_dev_path)(FWPathProvider *p, BusState *bus, DeviceState 
> *dev);
> +} FWPathProviderClass;
> +
> +char *fw_path_provider_get_dev_path(FWPathProvider *p, BusState *bus,
> +                                    DeviceState *dev);
> +char *fw_path_provider_try_get_dev_path(Object *o, BusState *bus,
> +                                        DeviceState *dev);
> +
> +#endif /* FW_PATH_PROVIDER_H */
> diff --git a/tests/Makefile b/tests/Makefile
> index 9a7d2f1..0692b11 100644
> --- a/tests/Makefile
> +++ b/tests/Makefile
> @@ -165,6 +165,7 @@ tests/test-int128$(EXESUF): tests/test-int128.o
>  tests/test-qdev-global-props$(EXESUF): tests/test-qdev-global-props.o \
>       hw/core/qdev.o hw/core/qdev-properties.o hw/core/hotplug.o\
>       hw/core/irq.o \
> +     hw/core/fw-path-provider.o \
>       $(qom-core-obj) \
>       $(test-qapi-obj-y) \
>       libqemuutil.a libqemustub.a
> 


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