efi_loader: disk: a helper function to create efi_disk objects from udevice

Add efi_disk_probe() function.
This function creates an efi_disk object for a raw disk device (UCLASS_BLK)
and additional objects for related partitions (UCLASS_PARTITION).

So this function is expected to be called through driver model's "probe"
interface every time one raw disk device is detected and activated.
We assume that partition devices (UCLASS_PARTITION) have been created
when this function is invoked.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

include/efi_loader.h

@@ -525,8 +525,8 @@ void efi_carve_out_dt_rsv(void *fdt);
 void efi_try_purge_kaslr_seed(void *fdt);
 /* Called by bootefi to make console interface available */
 efi_status_t efi_console_register(void);
-/* Called by bootefi to make all disk storage accessible as EFI objects */
-efi_status_t efi_disk_register(void);
+/* Called by efi_init_obj_list() to initialize efi_disks */
+efi_status_t efi_disk_init(void);
 /* Called by efi_init_obj_list() to install EFI_RNG_PROTOCOL */
 efi_status_t efi_rng_register(void);
 /* Called by efi_init_obj_list() to install EFI_TCG2_PROTOCOL */

lib/efi_driver/efi_block_device.c

@@ -35,6 +35,7 @@
 #include <malloc.h>
 #include <dm/device-internal.h>
 #include <dm/root.h>
+#include <dm/tag.h>
 
 /*
  * EFI attributes of the udevice handled by this driver.
@@ -106,25 +107,6 @@ static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 	return blkcnt;
 }
 
-/**
- * Create partions for the block device.
- *
- * @handle:	EFI handle of the block device
- * @dev:	udevice of the block device
- * Return:	number of partitions created
- */
-static int efi_bl_bind_partitions(efi_handle_t handle, struct udevice *dev)
-{
-	struct blk_desc *desc;
-	const char *if_typename;
-
-	desc = dev_get_uclass_plat(dev);
-	if_typename = blk_get_if_type_name(desc->if_type);
-
-	return efi_disk_create_partitions(handle, desc, if_typename,
-					  desc->devnum, dev->name);
-}
-
 /**
  * Create a block device for a handle
  *
@@ -139,7 +121,6 @@ static int efi_bl_bind(efi_handle_t handle, void *interface)
 	char *name;
 	struct efi_object *obj = efi_search_obj(handle);
 	struct efi_block_io *io = interface;
-	int disks;
 	struct efi_blk_plat *plat;
 
 	EFI_PRINT("%s: handle %p, interface %p\n", __func__, handle, io);
@@ -173,15 +154,20 @@ static int efi_bl_bind(efi_handle_t handle, void *interface)
 	plat->handle = handle;
 	plat->io = interface;
 
+	/*
+	 * FIXME: necessary because we won't do almost nothing in
+	 * efi_disk_create() when called from device_probe().
+	 */
+	ret = dev_tag_set_ptr(bdev, DM_TAG_EFI, handle);
+	if (ret)
+		/* FIXME: cleanup for bdev */
+		return ret;
+
 	ret = device_probe(bdev);
 	if (ret)
 		return ret;
 	EFI_PRINT("%s: block device '%s' created\n", __func__, bdev->name);
 
-	/* Create handles for the partions of the block device */
-	disks = efi_bl_bind_partitions(handle, bdev);
-	EFI_PRINT("Found %d partitions\n", disks);
-
 	return 0;
 }
 

lib/efi_loader/Kconfig

@@ -14,6 +14,8 @@ config EFI_LOADER
 	depends on DM_ETH || !NET
 	depends on !EFI_APP
 	default y if !ARM || SYS_CPU = armv7 || SYS_CPU = armv8
+	select DM_EVENT
+	select EVENT_DYNAMIC
 	select LIB_UUID
 	imply PARTITION_UUIDS
 	select HAVE_BLOCK_DEVICE
@@ -40,6 +42,7 @@ config CMD_BOOTEFI_BOOTMGR
 
 config EFI_SETUP_EARLY
 	bool
+	default y
 
 choice
 	prompt "Store for non-volatile UEFI variables"

lib/efi_loader/efi_disk.c

@@ -10,6 +10,9 @@
 #include <common.h>
 #include <blk.h>
 #include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/tag.h>
+#include <event.h>
 #include <efi_loader.h>
 #include <fs.h>
 #include <log.h>
@@ -487,103 +490,153 @@ error:
 	return ret;
 }
 
-/**
- * efi_disk_create_partitions() - create handles and protocols for partitions
+/*
+ * Create a handle for a whole raw disk
  *
- * Create handles and protocols for the partitions of a block device.
+ * @dev		uclass device (UCLASS_BLK)
  *
- * @parent:		handle of the parent disk
- * @desc:		block device
- * @if_typename:	interface type
- * @diskid:		device number
- * @pdevname:		device name
- * Return:		number of partitions created
+ * Create an efi_disk object which is associated with @dev.
+ * The type of @dev must be UCLASS_BLK.
+ *
+ * @return	0 on success, -1 otherwise
  */
-int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
-			       const char *if_typename, int diskid,
-			       const char *pdevname)
-{
-	int disks = 0;
-	char devname[32] = { 0 }; /* dp->str is u16[32] long */
-	int part;
-	struct efi_device_path *dp = NULL;
-	efi_status_t ret;
-	struct efi_handler *handler;
-
-	/* Get the device path of the parent */
-	ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
-	if (ret == EFI_SUCCESS)
-		dp = handler->protocol_interface;
-
-	/* Add devices for each partition */
-	for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
-		struct disk_partition info;
-
-		if (part_get_info(desc, part, &info))
-			continue;
-		snprintf(devname, sizeof(devname), "%s:%x", pdevname,
-			 part);
-		ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
-				       &info, part, NULL);
-		if (ret != EFI_SUCCESS) {
-			log_err("Adding partition %s failed\n", pdevname);
-			continue;
-		}
-		disks++;
-	}
-
-	return disks;
-}
-
-/**
- * efi_disk_register() - register block devices
- *
- * U-Boot doesn't have a list of all online disk devices. So when running our
- * EFI payload, we scan through all of the potentially available ones and
- * store them in our object pool.
- *
- * This function is called in efi_init_obj_list().
- *
- * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
- * Consider converting the code to look up devices as needed. The EFI device
- * could be a child of the UCLASS_BLK block device, perhaps.
- *
- * Return:	status code
- */
-efi_status_t efi_disk_register(void)
+static int efi_disk_create_raw(struct udevice *dev)
 {
 	struct efi_disk_obj *disk;
-	int disks = 0;
+	struct blk_desc *desc;
+	const char *if_typename;
+	int diskid;
 	efi_status_t ret;
-	struct udevice *dev;
 
-	for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
-	     uclass_next_device_check(&dev)) {
-		struct blk_desc *desc = dev_get_uclass_plat(dev);
-		const char *if_typename = blk_get_if_type_name(desc->if_type);
+	desc = dev_get_uclass_plat(dev);
+	if_typename = blk_get_if_type_name(desc->if_type);
+	diskid = desc->devnum;
 
-		/* Add block device for the full device */
-		log_info("Scanning disk %s...\n", dev->name);
-		ret = efi_disk_add_dev(NULL, NULL, if_typename,
-					desc, desc->devnum, NULL, 0, &disk);
-		if (ret == EFI_NOT_READY) {
+	ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
+			       diskid, NULL, 0, &disk);
+	if (ret != EFI_SUCCESS) {
+		if (ret == EFI_NOT_READY)
 			log_notice("Disk %s not ready\n", dev->name);
-			continue;
-		}
-		if (ret) {
-			log_err("ERROR: failure to add disk device %s, r = %lu\n",
-				dev->name, ret & ~EFI_ERROR_MASK);
-			continue;
-		}
-		disks++;
+		else
+			log_err("Adding disk for %s failed\n", dev->name);
 
-		/* Partitions show up as block devices in EFI */
-		disks += efi_disk_create_partitions(
-					&disk->header, desc, if_typename,
-					desc->devnum, dev->name);
+		return -1;
+	}
+	if (dev_tag_set_ptr(dev, DM_TAG_EFI, &disk->header)) {
+		efi_free_pool(disk->dp);
+		efi_delete_handle(&disk->header);
+
+		return -1;
 	}
 
-	log_info("Found %d disks\n", disks);
+	return 0;
+}
+
+/*
+ * Create a handle for a disk partition
+ *
+ * @dev		uclass device (UCLASS_PARTITION)
+ *
+ * Create an efi_disk object which is associated with @dev.
+ * The type of @dev must be UCLASS_PARTITION.
+ *
+ * @return	0 on success, -1 otherwise
+ */
+static int efi_disk_create_part(struct udevice *dev)
+{
+	efi_handle_t parent;
+	struct blk_desc *desc;
+	const char *if_typename;
+	struct disk_part *part_data;
+	struct disk_partition *info;
+	unsigned int part;
+	int diskid;
+	struct efi_handler *handler;
+	struct efi_device_path *dp_parent;
+	struct efi_disk_obj *disk;
+	efi_status_t ret;
+
+	if (dev_tag_get_ptr(dev_get_parent(dev), DM_TAG_EFI, (void **)&parent))
+		return -1;
+
+	desc = dev_get_uclass_plat(dev_get_parent(dev));
+	if_typename = blk_get_if_type_name(desc->if_type);
+	diskid = desc->devnum;
+
+	part_data = dev_get_uclass_plat(dev);
+	part = part_data->partnum;
+	info = &part_data->gpt_part_info;
+
+	ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
+	if (ret != EFI_SUCCESS)
+		return -1;
+	dp_parent = (struct efi_device_path *)handler->protocol_interface;
+
+	ret = efi_disk_add_dev(parent, dp_parent, if_typename, desc, diskid,
+			       info, part, &disk);
+	if (ret != EFI_SUCCESS) {
+		log_err("Adding partition for %s failed\n", dev->name);
+		return -1;
+	}
+	if (dev_tag_set_ptr(dev, DM_TAG_EFI, &disk->header)) {
+		efi_free_pool(disk->dp);
+		efi_delete_handle(&disk->header);
+
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Create efi_disk objects for a block device
+ *
+ * @dev		uclass device (UCLASS_BLK)
+ *
+ * Create efi_disk objects for partitions as well as a raw disk
+ * which is associated with @dev.
+ * The type of @dev must be UCLASS_BLK.
+ * This function is expected to be called at EV_PM_POST_PROBE.
+ *
+ * @return	0 on success, -1 otherwise
+ */
+static int efi_disk_probe(void *ctx, struct event *event)
+{
+	struct udevice *dev;
+	enum uclass_id id;
+	struct udevice *child;
+	int ret;
+
+	dev = event->data.dm.dev;
+	id = device_get_uclass_id(dev);
+
+	/* TODO: We won't support partitions in a partition */
+	if (id != UCLASS_BLK)
+		return 0;
+
+	ret = efi_disk_create_raw(dev);
+	if (ret)
+		return -1;
+
+	device_foreach_child(child, dev) {
+		ret = efi_disk_create_part(child);
+		if (ret)
+			return -1;
+	}
+
+	return 0;
+}
+
+efi_status_t efi_disk_init(void)
+{
+	int ret;
+
+	ret = event_register("efi_disk add", EVT_DM_POST_PROBE,
+			     efi_disk_probe, NULL);
+	if (ret) {
+		log_err("Event registration for efi_disk add failed\n");
+		return EFI_OUT_OF_RESOURCES;
+	}
 
 	return EFI_SUCCESS;
 }

lib/efi_loader/efi_setup.c

@@ -198,9 +198,7 @@ static efi_status_t __efi_init_early(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 
-#ifdef CONFIG_PARTITIONS
-	ret = efi_disk_register();
-#endif
+	ret = efi_disk_init();
 out:
 	return ret;
 }