efi_loader: make device path to text protocol customizable

The device path to text protocol is not needed for EBBR compliance. So
let's make it a customizable option.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

cmd/Kconfig

@@ -1436,6 +1436,7 @@ config CMD_DISPLAY
 config CMD_EFIDEBUG
 	bool "efidebug - display/configure UEFI environment"
 	depends on EFI_LOADER
+	select EFI_DEVICE_PATH_TO_TEXT
 	default n
 	help
 	  Enable the 'efidebug' command which provides a subset of UEFI

lib/efi_loader/Kconfig

@@ -18,6 +18,13 @@ config EFI_LOADER
 
 if EFI_LOADER
 
+config EFI_DEVICE_PATH_TO_TEXT
+	bool "Device path to text protocol"
+	default y
+	help
+	  The device path to text protocol converts device nodes and paths to
+	  human readable strings.
+
 config EFI_LOADER_HII
 	bool "HII protocols"
 	default y

lib/efi_loader/Makefile

@@ -21,7 +21,7 @@ obj-y += efi_bootmgr.o
 obj-y += efi_boottime.o
 obj-y += efi_console.o
 obj-y += efi_device_path.o
-obj-y += efi_device_path_to_text.o
+obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
 obj-y += efi_device_path_utilities.o
 obj-y += efi_file.o
 obj-$(CONFIG_EFI_LOADER_HII) += efi_hii.o efi_hii_config.o

lib/efi_loader/efi_root_node.c

@@ -52,9 +52,11 @@ efi_status_t efi_root_node_register(void)
 			(&efi_root,
 			 /* Device path protocol */
 			 &efi_guid_device_path, dp,
+#if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 			 /* Device path to text protocol */
 			 &efi_guid_device_path_to_text_protocol,
 			 (void *)&efi_device_path_to_text,
+#endif
 			 /* Device path utilities protocol */
 			 &efi_guid_device_path_utilities_protocol,
 			 (void *)&efi_device_path_utilities,

lib/efi_selftest/Makefile

@@ -17,7 +17,6 @@ efi_selftest_config_table.o \
 efi_selftest_controllers.o \
 efi_selftest_console.o \
 efi_selftest_crc32.o \
-efi_selftest_devicepath.o \
 efi_selftest_devicepath_util.o \
 efi_selftest_events.o \
 efi_selftest_event_groups.o \
@@ -38,6 +37,7 @@ efi_selftest_util.o \
 efi_selftest_variables.o \
 efi_selftest_watchdog.o
 
+obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_selftest_devicepath.o
 obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL) += efi_selftest_unicode_collation.o
 
 obj-$(CONFIG_CPU_V7) += efi_selftest_unaligned.o

lib/vsprintf.c

@@ -296,6 +296,7 @@ static char *string16(char *buf, char *end, u16 *s, int field_width,
 	return buf;
 }
 
+#if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 				int precision, int flags)
 {
@@ -314,6 +315,7 @@ static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 	return buf;
 }
 #endif
+#endif
 
 #ifdef CONFIG_CMD_NET
 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
@@ -451,7 +453,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 
 	switch (*fmt) {
 /* Device paths only exist in the EFI context. */
-#if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
+#if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
 	case 'D':
 		return device_path_string(buf, end, ptr, field_width,
 					  precision, flags);