[efi] Install the HII config access protocol on a child of the SNP handle

In edk2, there are several drivers that associate HII forms (and
corresponding config access protocol instances) with each individual
network device.  (In this context, "network device" means the EFI
handle on which the SNP protocol is installed, and on which the device
path ending with the MAC() node is installed also.)  Such edk2 drivers
are, for example: Ip4Dxe, HttpBootDxe, VlanConfigDxe.

In UEFI, any given handle can carry at most one instance of a specific
protocol (see e.g. the specification of the InstallProtocolInterface()
boot service).  This implies that the class of drivers mentioned above
can't install their EFI_HII_CONFIG_ACCESS_PROTOCOL instances on the
SNP handle directly -- they would conflict with each other.
Accordingly, each of those edk2 drivers creates a "private" child
handle under the SNP handle, and installs its config access protocol
(and corresponding HII package list) on its child handle.

The device path for the child handle is traditionally derived by
appending a Hardware Vendor Device Path node after the MAC() node.
The VenHw() nodes in question consist of a GUID (by definition), and
no trailing data (by choice).  The purpose of these VenHw() nodes is
only that all the child nodes can be uniquely identified by device
path.

At the moment iPXE does not follow this pattern.  It doesn't run into
a conflict when it installs its EFI_HII_CONFIG_ACCESS_PROTOCOL
directly on the SNP handle, but that's only because iPXE is the sole
driver not following the pattern.  This behavior seems risky (one
might call it a "latent bug"); better align iPXE with the edk2 custom.

Cc: Michael Brown <mcb30@ipxe.org>
Cc: Gary Lin <glin@suse.com>
Cc: Ladi Prosek <lprosek@redhat.com>
Ref: http://thread.gmane.org/gmane.comp.bios.edk2.devel/13494/focus=13532
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ladi Prosek <lprosek@redhat.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/efi/efi_snp.h

 	EFI_HII_CONFIG_ACCESS_PROTOCOL hii;
 	/** HII package list */
 	EFI_HII_PACKAGE_LIST_HEADER *package_list;
+	/** EFI child handle for HII association */
+	EFI_HANDLE hii_child_handle;
+	/** Device path of HII child handle */
+	EFI_DEVICE_PATH_PROTOCOL *hii_child_path;
 	/** HII handle */
 	EFI_HII_HANDLE hii_handle;
 	/** Device name */

src/interface/efi/efi_snp_hii.c

 #include <ipxe/efi/efi_hii.h>
 #include <ipxe/efi/efi_snp.h>
 #include <ipxe/efi/efi_strings.h>
+#include <ipxe/efi/efi_utils.h>
 #include <config/branding.h>
 
 /** EFI platform setup formset GUID */
  */
 int efi_snp_hii_install ( struct efi_snp_device *snpdev ) {
 	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	VENDOR_DEVICE_PATH *vendor_path;
+	EFI_DEVICE_PATH_PROTOCOL *path_end;
+	size_t path_prefix_len;
 	int efirc;
 	int rc;
 
 		goto err_build_package_list;
 	}
 
+	/* Allocate the new device path */
+	path_prefix_len = efi_devpath_len ( snpdev->path );
+	snpdev->hii_child_path = zalloc ( path_prefix_len +
+					  sizeof ( *vendor_path ) +
+					  sizeof ( *path_end ) );
+	if ( ! snpdev->hii_child_path ) {
+		DBGC ( snpdev,
+		       "SNPDEV %p could not allocate HII child device path\n",
+		       snpdev );
+		rc = -ENOMEM;
+		goto err_alloc_child_path;
+	}
+
+	/* Populate the device path */
+	memcpy ( snpdev->hii_child_path, snpdev->path, path_prefix_len );
+	vendor_path = ( ( ( void * ) snpdev->hii_child_path ) +
+			path_prefix_len );
+	vendor_path->Header.Type = HARDWARE_DEVICE_PATH;
+	vendor_path->Header.SubType = HW_VENDOR_DP;
+	vendor_path->Header.Length[0] = sizeof ( *vendor_path );
+	efi_snp_hii_random_guid ( &vendor_path->Guid );
+	path_end = ( ( void * ) ( vendor_path + 1 ) );
+	path_end->Type = END_DEVICE_PATH_TYPE;
+	path_end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
+	path_end->Length[0] = sizeof ( *path_end );
+
+	/* Create device path and child handle for HII association */
+	if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
+			&snpdev->hii_child_handle,
+			&efi_device_path_protocol_guid, snpdev->hii_child_path,
+			NULL ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( snpdev, "SNPDEV %p could not create HII child handle: "
+		       "%s\n", snpdev, strerror ( rc ) );
+		goto err_hii_child_handle;
+	}
+
 	/* Add HII packages */
 	if ( ( efirc = efihii->NewPackageList ( efihii, snpdev->package_list,
-						snpdev->handle,
+						snpdev->hii_child_handle,
 						&snpdev->hii_handle ) ) != 0 ) {
 		rc = -EEFI ( efirc );
 		DBGC ( snpdev, "SNPDEV %p could not add HII packages: %s\n",
 
 	/* Install HII protocol */
 	if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
-			 &snpdev->handle,
+			 &snpdev->hii_child_handle,
 			 &efi_hii_config_access_protocol_guid, &snpdev->hii,
 			 NULL ) ) != 0 ) {
 		rc = -EEFI ( efirc );
 		goto err_install_protocol;
 	}
 
+	/* Add as child of handle with SNP instance */
+	if ( ( rc = efi_child_add ( snpdev->handle,
+				    snpdev->hii_child_handle ) ) != 0 ) {
+		DBGC ( snpdev,
+		       "SNPDEV %p could not adopt HII child handle: %s\n",
+		       snpdev, strerror ( rc ) );
+		goto err_efi_child_add;
+	}
+
 	return 0;
 
+	efi_child_del ( snpdev->handle, snpdev->hii_child_handle );
+ err_efi_child_add:
 	bs->UninstallMultipleProtocolInterfaces (
-			snpdev->handle,
+			snpdev->hii_child_handle,
 			&efi_hii_config_access_protocol_guid, &snpdev->hii,
 			NULL );
  err_install_protocol:
 	efihii->RemovePackageList ( efihii, snpdev->hii_handle );
  err_new_package_list:
+	bs->UninstallMultipleProtocolInterfaces (
+			snpdev->hii_child_handle,
+			&efi_device_path_protocol_guid, snpdev->hii_child_path,
+			NULL );
+ err_hii_child_handle:
+	free ( snpdev->hii_child_path );
+	snpdev->hii_child_path = NULL;
+ err_alloc_child_path:
 	free ( snpdev->package_list );
 	snpdev->package_list = NULL;
  err_build_package_list:
 		return;
 
 	/* Uninstall protocols and remove package list */
+	efi_child_del ( snpdev->handle, snpdev->hii_child_handle );
 	bs->UninstallMultipleProtocolInterfaces (
-			snpdev->handle,
+			snpdev->hii_child_handle,
 			&efi_hii_config_access_protocol_guid, &snpdev->hii,
 			NULL );
 	efihii->RemovePackageList ( efihii, snpdev->hii_handle );
+	bs->UninstallMultipleProtocolInterfaces (
+			snpdev->hii_child_handle,
+			&efi_device_path_protocol_guid, snpdev->hii_child_path,
+			NULL );
+	free ( snpdev->hii_child_path );
+	snpdev->hii_child_path = NULL;
 	free ( snpdev->package_list );
 	snpdev->package_list = NULL;
 }