Re: [Qemu-devel] [PATCH 2/5] machine: introduce get_fw_dev_path() callback

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 11/26/2013 03:55 PM, Alexey Kardashevskiy wrote:
> Hi!
> 
> btw there is a problem with this patch - it does not compile for
> "linux-user" as there is no current-machine global variable defined in vl.c
> which is not compiled for linux-user.
> 
> How to solve this problem correctly?
> 
> 
> On 11/25/2013 06:27 PM, Alexey Kardashevskiy wrote:
>> QEMU supports firmware names for all devices in the QEMU tree but
>> sometime the exact format differs from what sPAPR platform uses.
>>
>> This introduces a callback to let a machine fix device tree path names.
>>
>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>> ---
>>  hw/core/qdev.c      | 15 ++++++++++++++-
>>  include/hw/boards.h |  1 +
>>  2 files changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
>> index e374a93..7347483 100644
>> --- a/hw/core/qdev.c
>> +++ b/hw/core/qdev.c
>> @@ -26,6 +26,7 @@
>>     this API directly.  */
>>  
>>  #include "hw/qdev.h"
>> +#include "hw/boards.h"
>>  #include "sysemu/sysemu.h"
>>  #include "qapi/error.h"
>>  #include "qapi/qmp/qerror.h"
>> @@ -497,6 +498,15 @@ static char *bus_get_fw_dev_path(BusState *bus, DeviceState *dev)
>>      return NULL;
>>  }
>>  
>> +static char *machine_get_fw_dev_path(BusState *bus, DeviceState *dev)
>> +{
>> +    if (current_machine->get_fw_dev_path) {
>> +        return current_machine->get_fw_dev_path(bus, dev);
>> +    }
>> +
>> +    return NULL;
>> +}
>> +


Anyone, please?

The only easy fix for this I can think of would be this:

extern QEMUMachine *current_machine __attribute__((weak));


But I suspect this is disgusting? :)


>>  static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
>>  {
>>      int l = 0;
>> @@ -504,7 +514,10 @@ 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 = machine_get_fw_dev_path(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/boards.h b/include/hw/boards.h
>> index 5a7ae9f..50ff24a 100644
>> --- a/include/hw/boards.h
>> +++ b/include/hw/boards.h
>> @@ -43,6 +43,7 @@ typedef struct QEMUMachine {
>>      GlobalProperty *compat_props;
>>      struct QEMUMachine *next;
>>      const char *hw_version;
>> +    char *(*get_fw_dev_path)(BusState *bus, DeviceState *dev);
>>  } QEMUMachine;
>>  
>>  int qemu_register_machine(QEMUMachine *m);
>>
> 
> 


-- 
Alexey