efi_loader: auto-generate boot option for each blkio device

Current efibootmgr auto-generates the boot option for all
disks and partitions installing EFI_SIMPLE_FILE_SYSTEM_PROTOCOL,
while EDK II reference implementation auto-generates the boot option
for all devices installing  EFI_BLOCK_IO_PROTOCOL with
eliminating logical partitions.

This commit modifies the efibootmgr to get aligned to EDK II.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

lib/efi_loader/efi_bootmgr.c

@@ -549,6 +549,50 @@ err:
 	return ret;
 }
 
+/**
+ * try_load_from_media() - load file from media
+ *
+ * @file_path:		file path
+ * @handle_img:		on return handle for the newly installed image
+ *
+ * If @file_path contains a file name, load the file.
+ * If @file_path does not have a file name, search the architecture-specific
+ * fallback boot file and load it.
+ * TODO: If the FilePathList[0] device does not support
+ * EFI_SIMPLE_FILE_SYSTEM_PROTOCOL but supports EFI_BLOCK_IO_PROTOCOL,
+ * call EFI_BOOT_SERVICES.ConnectController()
+ * TODO: FilePathList[0] device supports the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
+ * not based on EFI_BLOCK_IO_PROTOCOL
+ *
+ * Return:	status code
+ */
+static efi_status_t try_load_from_media(struct efi_device_path *file_path,
+					efi_handle_t *handle_img)
+{
+	efi_handle_t handle_blkdev;
+	efi_status_t ret = EFI_SUCCESS;
+	struct efi_device_path *rem, *dp = NULL;
+	struct efi_device_path *final_dp = file_path;
+
+	handle_blkdev = efi_dp_find_obj(file_path, &efi_block_io_guid, &rem);
+	if (handle_blkdev) {
+		if (rem->type == DEVICE_PATH_TYPE_END) {
+			/* no file name present, try default file */
+			ret = fill_default_file_path(handle_blkdev->dev, &dp);
+			if (ret != EFI_SUCCESS)
+				return ret;
+
+			final_dp = dp;
+		}
+	}
+
+	ret = EFI_CALL(efi_load_image(true, efi_root, final_dp, NULL, 0, handle_img));
+
+	efi_free_pool(dp);
+
+	return ret;
+}
+
 /**
  * try_load_entry() - try to load image for boot option
  *
@@ -583,7 +627,6 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle,
 	}
 
 	if (lo.attributes & LOAD_OPTION_ACTIVE) {
-		struct efi_device_path *file_path;
 		u32 attributes;
 
 		log_debug("trying to load \"%ls\" from %pD\n", lo.label,
@@ -600,10 +643,7 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle,
 			else
 				ret = EFI_LOAD_ERROR;
 		} else {
-			file_path = expand_media_path(lo.file_path);
+			ret = try_load_from_media(lo.file_path, handle);
-			ret = EFI_CALL(efi_load_image(true, efi_root, file_path,
-						      NULL, 0, handle));
-			efi_free_pool(file_path);
 		}
 		if (ret != EFI_SUCCESS) {
 			log_warning("Loading %ls '%ls' failed\n",
@@ -734,22 +774,23 @@ error:
 }
 
 /**
- * efi_bootmgr_enumerate_boot_option() - enumerate the possible bootable media
+ * efi_bootmgr_enumerate_boot_options() - enumerate the possible bootable media
  *
  * @opt:		pointer to the media boot option structure
- * @volume_handles:	pointer to the efi handles
+ * @handles:		pointer to block device handles
- * @count:		number of efi handle
+ * @count:		On entry number of handles to block devices.
+ *			On exit number of boot options.
  * Return:		status code
  */
-static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boot_option *opt,
+static efi_status_t
-						      efi_handle_t *volume_handles,
+efi_bootmgr_enumerate_boot_options(struct eficonfig_media_boot_option *opt,
-						      efi_status_t count)
+				   efi_handle_t *handles, efi_uintn_t *count)
 {
-	u32 i;
+	u32 i, num = 0;
 	struct efi_handler *handler;
 	efi_status_t ret = EFI_SUCCESS;
 
-	for (i = 0; i < count; i++) {
+	for (i = 0; i < *count; i++) {
 		u16 *p;
 		u16 dev_name[BOOTMENU_DEVICE_NAME_MAX];
 		char *optional_data;
@@ -757,8 +798,15 @@ static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boo
 		char buf[BOOTMENU_DEVICE_NAME_MAX];
 		struct efi_device_path *device_path;
 		struct efi_device_path *short_dp;
+		struct efi_block_io *blkio;
 
-		ret = efi_search_protocol(volume_handles[i], &efi_guid_device_path, &handler);
+		ret = efi_search_protocol(handles[i], &efi_block_io_guid, &handler);
+		blkio = handler->protocol_interface;
+
+		if (blkio->media->logical_partition)
+			continue;
+
+		ret = efi_search_protocol(handles[i], &efi_guid_device_path, &handler);
 		if (ret != EFI_SUCCESS)
 			continue;
 		ret = efi_protocol_open(handler, (void **)&device_path,
@@ -766,7 +814,7 @@ static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boo
 		if (ret != EFI_SUCCESS)
 			continue;
 
-		ret = efi_disk_get_device_name(volume_handles[i], buf, BOOTMENU_DEVICE_NAME_MAX);
+		ret = efi_disk_get_device_name(handles[i], buf, BOOTMENU_DEVICE_NAME_MAX);
 		if (ret != EFI_SUCCESS)
 			continue;
 
@@ -790,17 +838,20 @@ static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boo
 		 * to store guid, instead of realloc the load_option.
 		 */
 		lo.optional_data = "1234567";
-		opt[i].size = efi_serialize_load_option(&lo, (u8 **)&opt[i].lo);
+		opt[num].size = efi_serialize_load_option(&lo, (u8 **)&opt[num].lo);
-		if (!opt[i].size) {
+		if (!opt[num].size) {
 			ret = EFI_OUT_OF_RESOURCES;
 			goto out;
 		}
 		/* set the guid */
-		optional_data = (char *)opt[i].lo + (opt[i].size - u16_strsize(u"1234567"));
+		optional_data = (char *)opt[num].lo + (opt[num].size - u16_strsize(u"1234567"));
 		memcpy(optional_data, &efi_guid_bootmenu_auto_generated, sizeof(efi_guid_t));
+		num++;
 	}
 
 out:
+	*count = num;
+
 	return ret;
 }
 
@@ -1029,8 +1080,7 @@ efi_status_t efi_bootmgr_delete_boot_option(u16 boot_index)
 /**
  * efi_bootmgr_update_media_device_boot_option() - generate the media device boot option
  *
- * This function enumerates all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
+ * This function enumerates all BlockIo devices and add the boot option for it.
- * and generate the bootmenu entries.
  * This function also provide the BOOT#### variable maintenance for
  * the media device entries.
  * - Automatically create the BOOT#### variable for the newly detected device,
@@ -1046,13 +1096,13 @@ efi_status_t efi_bootmgr_update_media_device_boot_option(void)
 	u32 i;
 	efi_status_t ret;
 	efi_uintn_t count;
-	efi_handle_t *volume_handles = NULL;
+	efi_handle_t *handles = NULL;
 	struct eficonfig_media_boot_option *opt = NULL;
 
 	ret = efi_locate_handle_buffer_int(BY_PROTOCOL,
-					   &efi_simple_file_system_protocol_guid,
+					   &efi_block_io_guid,
 					   NULL, &count,
-					   (efi_handle_t **)&volume_handles);
+					   (efi_handle_t **)&handles);
 	if (ret != EFI_SUCCESS)
 		goto out;
 
@@ -1062,8 +1112,7 @@ efi_status_t efi_bootmgr_update_media_device_boot_option(void)
 		goto out;
 	}
 
-	/* enumerate all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL */
+	ret = efi_bootmgr_enumerate_boot_options(opt, handles, &count);
-	ret = efi_bootmgr_enumerate_boot_option(opt, volume_handles, count);
 	if (ret != EFI_SUCCESS)
 		goto out;
 
@@ -1111,7 +1160,7 @@ out:
 			free(opt[i].lo);
 	}
 	free(opt);
-	efi_free_pool(volume_handles);
+	efi_free_pool(handles);
 
 	if (ret == EFI_NOT_FOUND)
 		return EFI_SUCCESS;