Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI updates from Ingo Molnar:
 "Main changes:

   - Move efivarfs from the misc filesystem section to pseudo filesystem

   - Expose firmware platform size in sysfs

   - Improve robustness of get_memory_map() by removing assumptions on
     the size of efi_memory_desc_t.

  - various cleanups and fixes

  The biggest risk is the get_memory_map() change, which changes the way
  that both the arm64 and x86 EFI boot stub build the early memory map.
  There are no known regressions with it at the moment, BYMMV"

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: Don't look for chosen@0 node on DT platforms
  firmware: efi: Remove unneeded guid unparse
  efi/libstub: Call get_memory_map() to obtain map and desc sizes
  efi: Small leak on error in runtime map code
  efi: rtc-efi: Mark UIE as unsupported
  arm64/efi: efistub: Apply __init annotation
  efi: Expose underlying UEFI firmware platform size to userland
  efi: Rename efi_guid_unparse to efi_guid_to_str
  efi: Update the URLs for efibootmgr
  fs: Make efivarfs a pseudo filesystem, built by default with EFI

arch/arm64/kernel/efi-stub.c

@@ -13,7 +13,7 @@
 #include <asm/efi.h>
 #include <asm/sections.h>
 
-efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
+efi_status_t __init handle_kernel_image(efi_system_table_t *sys_table,
 					unsigned long *image_addr,
 					unsigned long *image_size,
 					unsigned long *reserve_addr,

block/partitions/efi.c

@@ -715,7 +715,7 @@ int efi_partition(struct parsed_partitions *state)
 			state->parts[i + 1].flags = ADDPART_FLAG_RAID;
 
 		info = &state->parts[i + 1].info;
-		efi_guid_unparse(&ptes[i].unique_partition_guid, info->uuid);
+		efi_guid_to_str(&ptes[i].unique_partition_guid, info->uuid);
 
 		/* Naively convert UTF16-LE to 7 bits. */
 		label_max = min(ARRAY_SIZE(info->volname) - 1,

drivers/firmware/efi/Kconfig

@@ -12,11 +12,11 @@ config EFI_VARS
 
 	  Note that using this driver in concert with efibootmgr requires
 	  at least test release version 0.5.0-test3 or later, which is
-	  available from Matt Domsch's website located at:
+	  available from:
 	  <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
 
 	  Subsequent efibootmgr releases may be found at:
-	  <http://linux.dell.com/efibootmgr>
+	  <http://github.com/vathpela/efibootmgr>
 
 config EFI_VARS_PSTORE
 	tristate "Register efivars backend for pstore"

drivers/firmware/efi/efi.c

@@ -115,15 +115,24 @@ EFI_ATTR_SHOW(fw_vendor);
 EFI_ATTR_SHOW(runtime);
 EFI_ATTR_SHOW(config_table);
 
+static ssize_t fw_platform_size_show(struct kobject *kobj,
+				     struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
+}
+
 static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
 static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
 static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
+static struct kobj_attribute efi_attr_fw_platform_size =
+	__ATTR_RO(fw_platform_size);
 
 static struct attribute *efi_subsys_attrs[] = {
 	&efi_attr_systab.attr,
 	&efi_attr_fw_vendor.attr,
 	&efi_attr_runtime.attr,
 	&efi_attr_config_table.attr,
+	&efi_attr_fw_platform_size.attr,
 	NULL,
 };
 
@@ -272,15 +281,10 @@ static __init int match_config_table(efi_guid_t *guid,
 				     unsigned long table,
 				     efi_config_table_type_t *table_types)
 {
-	u8 str[EFI_VARIABLE_GUID_LEN + 1];
 	int i;
 
 	if (table_types) {
-		efi_guid_unparse(guid, str);
-
 		for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
-			efi_guid_unparse(&table_types[i].guid, str);
-
 			if (!efi_guidcmp(*guid, table_types[i].guid)) {
 				*(table_types[i].ptr) = table;
 				pr_cont(" %s=0x%lx ",
@@ -403,8 +407,7 @@ static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
 	u64 val;
 	int i, len;
 
-	if (depth != 1 ||
-	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
+	if (depth != 1 || strcmp(uname, "chosen") != 0)
 		return 0;
 
 	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {

drivers/firmware/efi/efivars.c

@@ -39,7 +39,7 @@
  *   fix locking per Peter Chubb's findings
  *
  *  25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
- *   move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse()
+ *   move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_to_str()
  *
  *  12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
  *   use list_for_each_safe when deleting vars.
@@ -128,7 +128,7 @@ efivar_guid_read(struct efivar_entry *entry, char *buf)
 	if (!entry || !buf)
 		return 0;
 
-	efi_guid_unparse(&var->VendorGuid, str);
+	efi_guid_to_str(&var->VendorGuid, str);
 	str += strlen(str);
 	str += sprintf(str, "\n");
 
@@ -569,7 +569,7 @@ efivar_create_sysfs_entry(struct efivar_entry *new_var)
 	   private variables from another's.         */
 
 	*(short_name + strlen(short_name)) = '-';
-	efi_guid_unparse(&new_var->var.VendorGuid,
+	efi_guid_to_str(&new_var->var.VendorGuid,
 			 short_name + strlen(short_name));
 
 	new_var->kobj.kset = efivars_kset;

drivers/firmware/efi/libstub/Makefile

@@ -24,3 +24,17 @@ lib-y				:= efi-stub-helper.o
 lib-$(CONFIG_EFI_ARMSTUB)	+= arm-stub.o fdt.o
 
 CFLAGS_fdt.o			+= -I$(srctree)/scripts/dtc/libfdt/
+
+#
+# arm64 puts the stub in the kernel proper, which will unnecessarily retain all
+# code indefinitely unless it is annotated as __init/__initdata/__initconst etc.
+# So let's apply the __init annotations at the section level, by prefixing
+# the section names directly. This will ensure that even all the inline string
+# literals are covered.
+#
+extra-$(CONFIG_ARM64)		:= $(lib-y)
+lib-$(CONFIG_ARM64)		:= $(patsubst %.o,%.init.o,$(lib-y))
+
+OBJCOPYFLAGS := --prefix-alloc-sections=.init
+$(obj)/%.init.o: $(obj)/%.o FORCE
+	$(call if_changed,objcopy)

drivers/firmware/efi/libstub/arm-stub.c

@@ -17,10 +17,10 @@
 
 #include "efistub.h"
 
-static int __init efi_secureboot_enabled(efi_system_table_t *sys_table_arg)
+static int efi_secureboot_enabled(efi_system_table_t *sys_table_arg)
 {
-	static efi_guid_t const var_guid __initconst = EFI_GLOBAL_VARIABLE_GUID;
-	static efi_char16_t const var_name[] __initconst = {
+	static efi_guid_t const var_guid = EFI_GLOBAL_VARIABLE_GUID;
+	static efi_char16_t const var_name[] = {
 		'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0 };
 
 	efi_get_variable_t *f_getvar = sys_table_arg->runtime->get_variable;
@@ -164,7 +164,7 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
  * for both archictectures, with the arch-specific code provided in the
  * handle_kernel_image() function.
  */
-unsigned long __init efi_entry(void *handle, efi_system_table_t *sys_table,
+unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
 			       unsigned long *image_addr)
 {
 	efi_loaded_image_t *image;

drivers/firmware/efi/libstub/efi-stub-helper.c

@@ -66,25 +66,29 @@ efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
 	unsigned long key;
 	u32 desc_version;
 
-	*map_size = sizeof(*m) * 32;
-again:
+	*map_size = 0;
+	*desc_size = 0;
+	key = 0;
+	status = efi_call_early(get_memory_map, map_size, NULL,
+				&key, desc_size, &desc_version);
+	if (status != EFI_BUFFER_TOO_SMALL)
+		return EFI_LOAD_ERROR;
+
 	/*
 	 * Add an additional efi_memory_desc_t because we're doing an
 	 * allocation which may be in a new descriptor region.
 	 */
-	*map_size += sizeof(*m);
+	*map_size += *desc_size;
 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 				*map_size, (void **)&m);
 	if (status != EFI_SUCCESS)
 		goto fail;
 
-	*desc_size = 0;
-	key = 0;
 	status = efi_call_early(get_memory_map, map_size, m,
 				&key, desc_size, &desc_version);
 	if (status == EFI_BUFFER_TOO_SMALL) {
 		efi_call_early(free_pool, m);
-		goto again;
+		return EFI_LOAD_ERROR;
 	}
 
 	if (status != EFI_SUCCESS)
@@ -101,7 +105,7 @@ efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
 }
 
 
-unsigned long __init get_dram_base(efi_system_table_t *sys_table_arg)
+unsigned long get_dram_base(efi_system_table_t *sys_table_arg)
 {
 	efi_status_t status;
 	unsigned long map_size;

drivers/firmware/efi/runtime-map.c

@@ -191,7 +191,7 @@ int __init efi_runtime_map_init(struct kobject *efi_kobj)
 
 	return 0;
 out_add_entry:
-	for (j = i - 1; j > 0; j--) {
+	for (j = i - 1; j >= 0; j--) {
 		entry = *(map_entries + j);
 		kobject_put(&entry->kobj);
 	}

drivers/rtc/rtc-efi.c

@@ -218,6 +218,7 @@ static int __init efi_rtc_probe(struct platform_device *dev)
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
+	rtc->uie_unsupported = 1;
 	platform_set_drvdata(dev, rtc);
 
 	return 0;

fs/Kconfig

@@ -165,6 +165,7 @@ config HUGETLB_PAGE
 	def_bool HUGETLBFS
 
 source "fs/configfs/Kconfig"
+source "fs/efivarfs/Kconfig"
 
 endmenu
 
@@ -209,7 +210,6 @@ source "fs/sysv/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/exofs/Kconfig"
 source "fs/f2fs/Kconfig"
-source "fs/efivarfs/Kconfig"
 
 endif # MISC_FILESYSTEMS
 

fs/efivarfs/Kconfig

 config EFIVAR_FS
 	tristate "EFI Variable filesystem"
 	depends on EFI
+	default m
 	help
 	  efivarfs is a replacement filesystem for the old EFI
 	  variable support via sysfs, as it doesn't suffer from the

fs/efivarfs/super.c

@@ -140,7 +140,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
 
 	name[len] = '-';
 
-	efi_guid_unparse(&entry->var.VendorGuid, name + len + 1);
+	efi_guid_to_str(&entry->var.VendorGuid, name + len + 1);
 
 	name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';
 

include/linux/efi.h

@@ -848,7 +848,7 @@ efi_guidcmp (efi_guid_t left, efi_guid_t right)
 }
 
 static inline char *
-efi_guid_unparse(efi_guid_t *guid, char *out)
+efi_guid_to_str(efi_guid_t *guid, char *out)
 {
 	sprintf(out, "%pUl", guid->b);
         return out;