36 #define PROP_SUB_FDT "fdt"
107 	struct page *fdt;  member
120 	struct mutex lock; /* protects KHO FDT finalization */
448 static void __init kho_mem_deserialize(const void *fdt)  in kho_mem_deserialize()  argument
454 	mem = fdt_getprop(fdt, 0, PROP_PRESERVED_MEMORY_MAP, &len);  in kho_mem_deserialize()
684 			       const char *name, const void *fdt)  in kho_debugfs_fdt_add()  argument
693 	f->wrapper.data = (void *)fdt;  in kho_debugfs_fdt_add()
694 	f->wrapper.size = fdt_totalsize(fdt);  in kho_debugfs_fdt_add()
709  * kho_add_subtree - record the physical address of a sub FDT in KHO root tree.
712  * @fdt: the sub tree blob.
714  * Creates a new child node named @name in KHO root FDT and records
715  * the physical address of @fdt. The pages of @fdt must also be preserved
723 int kho_add_subtree(struct kho_serialization *ser, const char *name, void *fdt)  in kho_add_subtree()  argument
726 	u64 phys = (u64)virt_to_phys(fdt);  in kho_add_subtree()
727 	void *root = page_to_virt(ser->fdt);  in kho_add_subtree()
736 	return kho_debugfs_fdt_add(&ser->fdt_list, ser->sub_fdt_dir, name, fdt);  in kho_add_subtree()
1079 					  "fdt", page_to_virt(kho_out.ser.fdt));  in kho_out_update_debugfs_fdt()
1128 	void *fdt = page_to_virt(kho_out.ser.fdt);  in kho_finalize()  local
1130 	err |= fdt_create(fdt, PAGE_SIZE);  in kho_finalize()
1131 	err |= fdt_finish_reservemap(fdt);  in kho_finalize()
1132 	err |= fdt_begin_node(fdt, "");  in kho_finalize()
1133 	err |= fdt_property_string(fdt, "compatible", KHO_FDT_COMPATIBLE);  in kho_finalize()
1135 	 * Reserve the preserved-memory-map property in the root FDT, so  in kho_finalize()
1139 	err |= fdt_property_placeholder(fdt, PROP_PRESERVED_MEMORY_MAP,  in kho_finalize()
1145 	err = kho_preserve_folio(page_folio(kho_out.ser.fdt));  in kho_finalize()
1161 	err |= fdt_end_node(fdt);  in kho_finalize()
1162 	err |= fdt_finish(fdt);  in kho_finalize()
1291  * operation with KHO enabled, by verifying that a valid KHO FDT
1307  * kho_retrieve_subtree - retrieve a preserved sub FDT by its name.
1308  * @name: the name of the sub FDT passed to kho_add_subtree().
1309  * @phys: if found, the physical address of the sub FDT is stored in @phys.
1311  * Retrieve a preserved sub FDT named @name and store its physical
1318 	const void *fdt = kho_get_fdt();  in kho_retrieve_subtree()  local
1322 	if (!fdt)  in kho_retrieve_subtree()
1328 	offset = fdt_subnode_offset(fdt, 0, name);  in kho_retrieve_subtree()
1332 	val = fdt_getprop(fdt, offset, PROP_SUB_FDT, &len);  in kho_retrieve_subtree()
1344 static __init int kho_in_debugfs_init(const void *fdt)  in kho_in_debugfs_init()  argument
1359 	err = kho_debugfs_fdt_add(&kho_in.fdt_list, kho_in.dir, "fdt", fdt);  in kho_in_debugfs_init()
1363 	fdt_for_each_subnode(child, fdt, 0) {  in kho_in_debugfs_init()
1365 		const char *name = fdt_get_name(fdt, child, NULL);  in kho_in_debugfs_init()
1368 		fdt_phys = fdt_getprop(fdt, child, "fdt", &len);  in kho_in_debugfs_init()
1372 			pr_warn("node `%s`'s prop `fdt` has invalid length: %d\n",  in kho_in_debugfs_init()
1379 			pr_warn("failed to add fdt `%s` to debugfs: %d\n", name,  in kho_in_debugfs_init()
1395 	const void *fdt = kho_get_fdt();  in kho_init()  local
1400 	kho_out.ser.fdt = alloc_page(GFP_KERNEL);  in kho_init()
1401 	if (!kho_out.ser.fdt) {  in kho_init()
1416 	if (fdt) {  in kho_init()
1417 		err = kho_in_debugfs_init(fdt);  in kho_init()
1424 			pr_err("failed exposing handover FDT in debugfs: %d\n",  in kho_init()
1443 	put_page(kho_out.ser.fdt);  in kho_init()
1444 	kho_out.ser.fdt = NULL;  in kho_init()
1492 			pr_warn("failed to restore folio for KHO fdt\n");  in kho_memory_init()
1501 	void *fdt = NULL;  in kho_populate()  local
1506 	/* Validate the input FDT */  in kho_populate()
1507 	fdt = early_memremap(fdt_phys, fdt_len);  in kho_populate()
1508 	if (!fdt) {  in kho_populate()
1509 		pr_warn("setup: failed to memremap FDT (0x%llx)\n", fdt_phys);  in kho_populate()
1513 	err = fdt_check_header(fdt);  in kho_populate()
1515 		pr_warn("setup: handover FDT (0x%llx) is invalid: %d\n",  in kho_populate()
1520 	err = fdt_node_check_compatible(fdt, 0, KHO_FDT_COMPATIBLE);  in kho_populate()
1522 		pr_warn("setup: handover FDT (0x%llx) is incompatible with '%s': %d\n",  in kho_populate()
1572 	if (fdt)  in kho_populate()
1573 		early_memunmap(fdt, fdt_len);  in kho_populate()
1591 	image->kho.fdt = page_to_phys(kho_out.ser.fdt);  in kho_fill_kimage()