To understand what happens in OpenProtocol it is necessary to know
the protocol interface GUID. Let's write a debug message.

Using uuid_guid_get_str would be quite clumsy for this purpose.
This would involve evaluating _DEBUG which probably should not be used
outside common.h.

Cc: Rob Clark <robdcl...@gmail.com>
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
v3:
        reference uuid_guid_get_str
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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