On Sat, Aug 5, 2017 at 1:28 PM, Rob Clark <robdcl...@gmail.com> wrote:
> On Sat, Aug 5, 2017 at 12:58 PM, Heinrich Schuchardt <xypron.g...@gmx.de> 
> wrote:
>> To understand what happens in OpenProtocol it is necessary to know
>> the protocol interface GUID. Let's write a debug message.
>
> btw, my "efi_loader: add guidstr helper" patch could make this a bit
> simpler I suppose.. either way it would be nice to have a macro like
> this.. I had been using something similar for debug locally

on second thought.. linux kernel's printk has a format modifier for
printing guid ptrs..  maybe this is a better idea than both
EFI_PRINT_GUID() and my 'add guidstr helper' patch, since it would
work with both printf and sprintf.

(I think the conclusion was anything that actually needed tiny-printf
didn't need EFI_LOADER.)

BR,
-R

> Reviewed-by: Rob Clark <robdcl...@gmail.com>
>
> BR,
> -R
>
>> Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
>> ---
>> v2:
>>         fix typo in commit message
>> ---
>>  include/efi_loader.h          | 14 ++++++++++++++
>>  lib/efi_loader/efi_boottime.c |  2 ++
>>  2 files changed, 16 insertions(+)
>>
>> diff --git a/include/efi_loader.h b/include/efi_loader.h
>> index 037cc7c543..553c615f11 100644
>> --- a/include/efi_loader.h
>> +++ b/include/efi_loader.h
>> @@ -51,6 +51,20 @@ const char *__efi_nesting_dec(void);
>>         debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
>>         } while(0)
>>
>> +/*
>> + * Write GUID
>> + */
>> +#define EFI_PRINT_GUID(txt, guid) ({ \
>> +       debug("EFI: %s %02x%02x%02x%02x-%02x%02x-%02x%02x-" \
>> +             "%02x%02x%02x%02x%02x%02x%02x%02x\n", \
>> +             txt, ((u8 *)guid)[3], \
>> +             ((u8 *)guid)[2], ((u8 *)guid)[1], ((u8 *)guid)[0], \
>> +             ((u8 *)guid)[5], ((u8 *)guid)[4], ((u8 *)guid)[7], \
>> +             ((u8 *)guid)[6], ((u8 *)guid)[8], ((u8 *)guid)[9], \
>> +             ((u8 *)guid)[10], ((u8 *)guid)[11], ((u8 *)guid)[12], \
>> +             ((u8 *)guid)[13], ((u8 *)guid)[14], ((u8 *)guid)[15]); \
>> +       })
>> +
>>  extern struct efi_runtime_services efi_runtime_services;
>>  extern struct efi_system_table systab;
>>
>> diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
>> index fb05c9e093..ebb557abb2 100644
>> --- a/lib/efi_loader/efi_boottime.c
>> +++ b/lib/efi_loader/efi_boottime.c
>> @@ -1138,6 +1138,8 @@ static efi_status_t EFIAPI efi_open_protocol(
>>                 goto out;
>>         }
>>
>> +       EFI_PRINT_GUID("protocol:", protocol);
>> +
>>         switch (attributes) {
>>         case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
>>         case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
>> --
>> 2.11.0
>>
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