Merge tag 'efi-next-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI updates from Ard Biesheuvel:

 - Enable mirrored memory for arm64

 - Fix up several abuses of the efivar API

 - Refactor the efivar API in preparation for moving the 'business
   logic' part of it into efivarfs

 - Enable ACPI PRM on arm64

* tag 'efi-next-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: (24 commits)
  ACPI: Move PRM config option under the main ACPI config
  ACPI: Enable Platform Runtime Mechanism(PRM) support on ARM64
  ACPI: PRM: Change handler_addr type to void pointer
  efi: Simplify arch_efi_call_virt() macro
  drivers: fix typo in firmware/efi/memmap.c
  efi: vars: Drop __efivar_entry_iter() helper which is no longer used
  efi: vars: Use locking version to iterate over efivars linked lists
  efi: pstore: Omit efivars caching EFI varstore access layer
  efi: vars: Add thin wrapper around EFI get/set variable interface
  efi: vars: Don't drop lock in the middle of efivar_init()
  pstore: Add priv field to pstore_record for backend specific use
  Input: applespi - avoid efivars API and invoke EFI services directly
  selftests/kexec: remove broken EFI_VARS secure boot fallback check
  brcmfmac: Switch to appropriate helper to load EFI variable contents
  iwlwifi: Switch to proper EFI variable store interface
  media: atomisp_gmin_platform: stop abusing efivar API
  efi: efibc: avoid efivar API for setting variables
  efi: avoid efivars layer when loading SSDTs from variables
  efi: Correct comment on efi_memmap_alloc
  memblock: Disable mirror feature if kernelcore is not specified
  ...

arch/arm/include/asm/efi.h

@@ -24,13 +24,6 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 #define arch_efi_call_virt_setup()	efi_virtmap_load()
 #define arch_efi_call_virt_teardown()	efi_virtmap_unload()
 
-#define arch_efi_call_virt(p, f, args...)				\
-({									\
-	efi_##f##_t *__f;						\
-	__f = p->f;							\
-	__f(args);							\
-})
-
 #define ARCH_EFI_IRQ_FLAGS_MASK \
 	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
 	 PSR_T_BIT | MODE_MASK)

arch/arm64/include/asm/efi.h

@@ -27,12 +27,9 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 	__efi_fpsimd_begin();						\
 })
 
+#undef arch_efi_call_virt
 #define arch_efi_call_virt(p, f, args...)				\
-({									\
-	efi_##f##_t *__f;						\
-	__f = p->f;							\
-	__efi_rt_asm_wrapper(__f, #f, args);				\
-})
+	__efi_rt_asm_wrapper((p)->f, #f, args)
 
 #define arch_efi_call_virt_teardown()					\
 ({									\

arch/arm64/mm/init.c

@@ -350,8 +350,8 @@ void __init arm64_memblock_init(void)
 			"initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
 			phys_initrd_size = 0;
 		} else {
-			memblock_remove(base, size); /* clear MEMBLOCK_ flags */
 			memblock_add(base, size);
+			memblock_clear_nomap(base, size);
 			memblock_reserve(base, size);
 		}
 	}

arch/loongarch/include/asm/efi.h

@@ -13,20 +13,8 @@ void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
 
 #define ARCH_EFI_IRQ_FLAGS_MASK  0x00000004  /* Bit 2: CSR.CRMD.IE */
 
-#define arch_efi_call_virt_setup()               \
-({                                               \
-})
-
-#define arch_efi_call_virt(p, f, args...)        \
-({                                               \
-	efi_##f##_t * __f;                       \
-	__f = p->f;                              \
-	__f(args);                               \
-})
-
-#define arch_efi_call_virt_teardown()            \
-({                                               \
-})
+#define arch_efi_call_virt_setup()
+#define arch_efi_call_virt_teardown()
 
 #define EFI_ALLOC_ALIGN		SZ_64K
 

arch/riscv/include/asm/efi.h

@@ -23,8 +23,6 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 #define arch_efi_call_virt_setup()      efi_virtmap_load()
 #define arch_efi_call_virt_teardown()   efi_virtmap_unload()
 
-#define arch_efi_call_virt(p, f, args...) p->f(args)
-
 #define ARCH_EFI_IRQ_FLAGS_MASK (SR_IE | SR_SPIE)
 
 /* Load initrd anywhere in system RAM */

arch/x86/include/asm/efi.h

@@ -100,8 +100,6 @@ static inline void efi_fpu_end(void)
 	efi_fpu_end();							\
 })
 
-#define arch_efi_call_virt(p, f, args...)	p->f(args)
-
 #else /* !CONFIG_X86_32 */
 
 #define EFI_LOADER_SIGNATURE	"EL64"
@@ -121,6 +119,7 @@ extern asmlinkage u64 __efi_call(void *fp, ...);
 	efi_enter_mm();							\
 })
 
+#undef arch_efi_call_virt
 #define arch_efi_call_virt(p, f, args...) ({				\
 	u64 ret, ibt = ibt_save();					\
 	ret = efi_call((void *)p->f, args);				\
@@ -383,7 +382,6 @@ static inline bool efi_is_64bit(void)
 extern bool efi_reboot_required(void);
 extern bool efi_is_table_address(unsigned long phys_addr);
 
-extern void efi_find_mirror(void);
 extern void efi_reserve_boot_services(void);
 #else
 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
@@ -395,9 +393,6 @@ static inline  bool efi_is_table_address(unsigned long phys_addr)
 {
 	return false;
 }
-static inline void efi_find_mirror(void)
-{
-}
 static inline void efi_reserve_boot_services(void)
 {
 }

arch/x86/platform/efi/efi.c

@@ -108,29 +108,6 @@ static int __init setup_add_efi_memmap(char *arg)
 }
 early_param("add_efi_memmap", setup_add_efi_memmap);
 
-void __init efi_find_mirror(void)
-{
-	efi_memory_desc_t *md;
-	u64 mirror_size = 0, total_size = 0;
-
-	if (!efi_enabled(EFI_MEMMAP))
-		return;
-
-	for_each_efi_memory_desc(md) {
-		unsigned long long start = md->phys_addr;
-		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
-
-		total_size += size;
-		if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
-			memblock_mark_mirror(start, size);
-			mirror_size += size;
-		}
-	}
-	if (mirror_size)
-		pr_info("Memory: %lldM/%lldM mirrored memory\n",
-			mirror_size>>20, total_size>>20);
-}
-
 /*
  * Tell the kernel about the EFI memory map.  This might include
  * more than the max 128 entries that can fit in the passed in e820

drivers/acpi/Kconfig

@@ -572,6 +572,21 @@ source "drivers/acpi/pmic/Kconfig"
 config ACPI_VIOT
 	bool
 
+config ACPI_PRMT
+	bool "Platform Runtime Mechanism Support"
+	depends on EFI && (X86_64 || ARM64)
+	default y
+	help
+	  Platform Runtime Mechanism (PRM) is a firmware interface exposing a
+	  set of binary executables that can be called from the AML interpreter
+	  or directly from device drivers.
+
+	  Say Y to enable the AML interpreter to execute the PRM code.
+
+	  While this feature is optional in principle, leaving it out may
+	  substantially increase computational overhead related to the
+	  initialization of some server systems.
+
 endif	# ACPI
 
 config X86_PM_TIMER
@@ -589,18 +604,3 @@ config X86_PM_TIMER
 
 	  You should nearly always say Y here because many modern
 	  systems require this timer.
-
-config ACPI_PRMT
-	bool "Platform Runtime Mechanism Support"
-	depends on EFI && X86_64
-	default y
-	help
-	  Platform Runtime Mechanism (PRM) is a firmware interface exposing a
-	  set of binary executables that can be called from the AML interpreter
-	  or directly from device drivers.
-
-	  Say Y to enable the AML interpreter to execute the PRM code.
-
-	  While this feature is optional in principle, leaving it out may
-	  substantially increase computational overhead related to the
-	  initialization of some server systems.

drivers/acpi/prmt.c

@@ -53,7 +53,7 @@ static LIST_HEAD(prm_module_list);
 
 struct prm_handler_info {
 	guid_t guid;
-	u64 handler_addr;
+	void *handler_addr;
 	u64 static_data_buffer_addr;
 	u64 acpi_param_buffer_addr;
 
@@ -148,7 +148,7 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
 		th = &tm->handlers[cur_handler];
 
 		guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
-		th->handler_addr = efi_pa_va_lookup(handler_info->handler_address);
+		th->handler_addr = (void *)efi_pa_va_lookup(handler_info->handler_address);
 		th->static_data_buffer_addr = efi_pa_va_lookup(handler_info->static_data_buffer_address);
 		th->acpi_param_buffer_addr = efi_pa_va_lookup(handler_info->acpi_param_buffer_address);
 	} while (++cur_handler < tm->handler_count && (handler_info = get_next_handler(handler_info)));

drivers/firmware/efi/Kconfig

@@ -22,6 +22,7 @@ config EFI_ESRT
 config EFI_VARS_PSTORE
 	tristate "Register efivars backend for pstore"
 	depends on PSTORE
+	select UCS2_STRING
 	default y
 	help
 	  Say Y here to enable use efivars as a backend to pstore. This
@@ -145,6 +146,7 @@ config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER
 
 config EFI_BOOTLOADER_CONTROL
 	tristate "EFI Bootloader Control"
+	select UCS2_STRING
 	default n
 	help
 	  This module installs a reboot hook, such that if reboot() is

drivers/firmware/efi/efi-init.c

@@ -240,6 +240,7 @@ void __init efi_init(void)
 	 * And now, memblock is fully populated, it is time to do capping.
 	 */
 	early_init_dt_check_for_usable_mem_range();
+	efi_find_mirror();
 	efi_esrt_init();
 	efi_mokvar_table_init();
 

drivers/firmware/efi/efi.c

@@ -202,7 +202,7 @@ static void generic_ops_unregister(void)
 }
 
 #ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
-#define EFIVAR_SSDT_NAME_MAX	16
+#define EFIVAR_SSDT_NAME_MAX	16UL
 static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
 static int __init efivar_ssdt_setup(char *str)
 {
@@ -219,83 +219,62 @@ static int __init efivar_ssdt_setup(char *str)
 }
 __setup("efivar_ssdt=", efivar_ssdt_setup);
 
-static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
-				   unsigned long name_size, void *data)
-{
-	struct efivar_entry *entry;
-	struct list_head *list = data;
-	char utf8_name[EFIVAR_SSDT_NAME_MAX];
-	int limit = min_t(unsigned long, EFIVAR_SSDT_NAME_MAX, name_size);
-
-	ucs2_as_utf8(utf8_name, name, limit - 1);
-	if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
-		return 0;
-
-	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
-	if (!entry)
-		return 0;
-
-	memcpy(entry->var.VariableName, name, name_size);
-	memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
-
-	efivar_entry_add(entry, list);
-
-	return 0;
-}
-
 static __init int efivar_ssdt_load(void)
 {
-	LIST_HEAD(entries);
-	struct efivar_entry *entry, *aux;
-	unsigned long size;
-	void *data;
-	int ret;
+	unsigned long name_size = 256;
+	efi_char16_t *name = NULL;
+	efi_status_t status;
+	efi_guid_t guid;
 
 	if (!efivar_ssdt[0])
 		return 0;
 
-	ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
-
-	list_for_each_entry_safe(entry, aux, &entries, list) {
-		pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
-			&entry->var.VendorGuid);
+	name = kzalloc(name_size, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
 
-		list_del(&entry->list);
+	for (;;) {
+		char utf8_name[EFIVAR_SSDT_NAME_MAX];
+		unsigned long data_size = 0;
+		void *data;
+		int limit;
 
-		ret = efivar_entry_size(entry, &size);
-		if (ret) {
-			pr_err("failed to get var size\n");
-			goto free_entry;
+		status = efi.get_next_variable(&name_size, name, &guid);
+		if (status == EFI_NOT_FOUND) {
+			break;
+		} else if (status == EFI_BUFFER_TOO_SMALL) {
+			name = krealloc(name, name_size, GFP_KERNEL);
+			if (!name)
+				return -ENOMEM;
+			continue;
 		}
 
-		data = kmalloc(size, GFP_KERNEL);
-		if (!data) {
-			ret = -ENOMEM;
-			goto free_entry;
-		}
+		limit = min(EFIVAR_SSDT_NAME_MAX, name_size);
+		ucs2_as_utf8(utf8_name, name, limit - 1);
+		if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
+			continue;
 
-		ret = efivar_entry_get(entry, NULL, &size, data);
-		if (ret) {
-			pr_err("failed to get var data\n");
-			goto free_data;
-		}
+		pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, &guid);
 
-		ret = acpi_load_table(data, NULL);
-		if (ret) {
-			pr_err("failed to load table: %d\n", ret);
-			goto free_data;
-		}
+		status = efi.get_variable(name, &guid, NULL, &data_size, NULL);
+		if (status != EFI_BUFFER_TOO_SMALL || !data_size)
+			return -EIO;
 
-		goto free_entry;
+		data = kmalloc(data_size, GFP_KERNEL);
+		if (!data)
+			return -ENOMEM;
 
-free_data:
+		status = efi.get_variable(name, &guid, NULL, &data_size, data);
+		if (status == EFI_SUCCESS) {
+			acpi_status ret = acpi_load_table(data, NULL);
+			if (ret)
+				pr_err("failed to load table: %u\n", ret);
+		} else {
+			pr_err("failed to get var data: 0x%lx\n", status);
+		}
 		kfree(data);
-
-free_entry:
-		kfree(entry);
 	}
-
-	return ret;
+	return 0;
 }
 #else
 static inline int efivar_ssdt_load(void) { return 0; }
@@ -446,6 +425,29 @@ static int __init efisubsys_init(void)
 
 subsys_initcall(efisubsys_init);
 
+void __init efi_find_mirror(void)
+{
+	efi_memory_desc_t *md;
+	u64 mirror_size = 0, total_size = 0;
+
+	if (!efi_enabled(EFI_MEMMAP))
+		return;
+
+	for_each_efi_memory_desc(md) {
+		unsigned long long start = md->phys_addr;
+		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+
+		total_size += size;
+		if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
+			memblock_mark_mirror(start, size);
+			mirror_size += size;
+		}
+	}
+	if (mirror_size)
+		pr_info("Memory: %lldM/%lldM mirrored memory\n",
+			mirror_size>>20, total_size>>20);
+}
+
 /*
  * Find the efi memory descriptor for a given physical address.  Given a
  * physical address, determine if it exists within an EFI Memory Map entry,

drivers/firmware/efi/efibc.c

@@ -10,69 +10,51 @@
 #include <linux/module.h>
 #include <linux/reboot.h>
 #include <linux/slab.h>
+#include <linux/ucs2_string.h>
 
-static void efibc_str_to_str16(const char *str, efi_char16_t *str16)
-{
-	size_t i;
-
-	for (i = 0; i < strlen(str); i++)
-		str16[i] = str[i];
-
-	str16[i] = '\0';
-}
+#define MAX_DATA_LEN	512
 
-static int efibc_set_variable(const char *name, const char *value)
+static int efibc_set_variable(efi_char16_t *name, efi_char16_t *value,
+			      unsigned long len)
 {
-	int ret;
-	efi_guid_t guid = LINUX_EFI_LOADER_ENTRY_GUID;
-	struct efivar_entry *entry;
-	size_t size = (strlen(value) + 1) * sizeof(efi_char16_t);
+	efi_status_t status;
 
-	if (size > sizeof(entry->var.Data)) {
-		pr_err("value is too large (%zu bytes) for '%s' EFI variable\n", size, name);
-		return -EINVAL;
-	}
+	status = efi.set_variable(name, &LINUX_EFI_LOADER_ENTRY_GUID,
+				  EFI_VARIABLE_NON_VOLATILE
+				  | EFI_VARIABLE_BOOTSERVICE_ACCESS
+				  | EFI_VARIABLE_RUNTIME_ACCESS,
+				  len * sizeof(efi_char16_t), value);
 
-	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
-	if (!entry) {
-		pr_err("failed to allocate efivar entry for '%s' EFI variable\n", name);
-		return -ENOMEM;
+	if (status != EFI_SUCCESS) {
+		pr_err("failed to set EFI variable: 0x%lx\n", status);
+		return -EIO;
 	}
-
-	efibc_str_to_str16(name, entry->var.VariableName);
-	efibc_str_to_str16(value, (efi_char16_t *)entry->var.Data);
-	memcpy(&entry->var.VendorGuid, &guid, sizeof(guid));
-
-	ret = efivar_entry_set_safe(entry->var.VariableName,
-				    entry->var.VendorGuid,
-				    EFI_VARIABLE_NON_VOLATILE
-				    | EFI_VARIABLE_BOOTSERVICE_ACCESS
-				    | EFI_VARIABLE_RUNTIME_ACCESS,
-				    false, size, entry->var.Data);
-
-	if (ret)
-		pr_err("failed to set %s EFI variable: 0x%x\n",
-		       name, ret);
-
-	kfree(entry);
-	return ret;
+	return 0;
 }
 
 static int efibc_reboot_notifier_call(struct notifier_block *notifier,
 				      unsigned long event, void *data)
 {
-	const char *reason = "shutdown";
+	efi_char16_t *reason = event == SYS_RESTART ? L"reboot"
+						    : L"shutdown";
+	const u8 *str = data;
+	efi_char16_t *wdata;
+	unsigned long l;
 	int ret;
 
-	if (event == SYS_RESTART)
-		reason = "reboot";
-
-	ret = efibc_set_variable("LoaderEntryRebootReason", reason);
+	ret = efibc_set_variable(L"LoaderEntryRebootReason", reason,
+				 ucs2_strlen(reason));
 	if (ret || !data)
 		return NOTIFY_DONE;
 
-	efibc_set_variable("LoaderEntryOneShot", (char *)data);
+	wdata = kmalloc(MAX_DATA_LEN * sizeof(efi_char16_t), GFP_KERNEL);
+	for (l = 0; l < MAX_DATA_LEN - 1 && str[l] != '\0'; l++)
+		wdata[l] = str[l];
+	wdata[l] = L'\0';
+
+	efibc_set_variable(L"LoaderEntryOneShot", wdata, l);
 
+	kfree(wdata);
 	return NOTIFY_DONE;
 }
 
@@ -84,7 +66,7 @@ static int __init efibc_init(void)
 {
 	int ret;
 
-	if (!efivars_kobject() || !efivar_supports_writes())
+	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
 		return -ENODEV;
 
 	ret = register_reboot_notifier(&efibc_reboot_notifier);

drivers/firmware/efi/efivars.c

@@ -467,16 +467,12 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
 	else if (__efivar_entry_delete(entry))
 		err = -EIO;
 
-	if (err) {
-		efivar_entry_iter_end();
+	efivar_entry_iter_end();
+
+	if (err)
 		return err;
-	}
 
-	if (!entry->scanning) {
-		efivar_entry_iter_end();
-		efivar_unregister(entry);
-	} else
-		efivar_entry_iter_end();
+	efivar_unregister(entry);
 
 	/* It's dead Jim.... */
 	return count;
@@ -527,10 +523,7 @@ efivar_create_sysfs_entry(struct efivar_entry *new_var)
 	}
 
 	kobject_uevent(&new_var->kobj, KOBJ_ADD);
-	if (efivar_entry_add(new_var, &efivar_sysfs_list)) {
-		efivar_unregister(new_var);
-		return -EINTR;
-	}
+	__efivar_entry_add(new_var, &efivar_sysfs_list);
 
 	return 0;
 }
@@ -609,10 +602,7 @@ static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
 
 static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
 {
-	int err = efivar_entry_remove(entry);
-
-	if (err)
-		return err;
+	efivar_entry_remove(entry);
 	efivar_unregister(entry);
 	return 0;
 }
@@ -622,8 +612,7 @@ static void efivars_sysfs_exit(void)
 	/* Remove all entries and destroy */
 	int err;
 
-	err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list,
-				  NULL, NULL);
+	err = efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL);
 	if (err) {
 		pr_err("efivars: Failed to destroy sysfs entries\n");
 		return;

drivers/firmware/efi/memmap.c

@@ -59,8 +59,7 @@ static void __init efi_memmap_free(void)
  * Depending on whether mm_init() has already been invoked or not,
  * either memblock or "normal" page allocation is used.
  *
- * Returns the physical address of the allocated memory map on
- * success, zero on failure.
+ * Returns zero on success, a negative error code on failure.
  */
 int __init efi_memmap_alloc(unsigned int num_entries,
 		struct efi_memory_map_data *data)
@@ -245,7 +244,7 @@ int __init efi_memmap_install(struct efi_memory_map_data *data)
  * @range: Address range (start, end) to split around
  *
  * Returns the number of additional EFI memmap entries required to
- * accomodate @range.
+ * accommodate @range.
  */
 int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
 {

drivers/firmware/efi/vars.c

@@ -298,14 +298,10 @@ efivar_variable_is_removable(efi_guid_t vendor, const char *var_name,
 }
 EXPORT_SYMBOL_GPL(efivar_variable_is_removable);
 
-static efi_status_t
-check_var_size(u32 attributes, unsigned long size)
+efi_status_t check_var_size(u32 attributes, unsigned long size)
 {
 	const struct efivar_operations *fops;
 
-	if (!__efivars)
-		return EFI_UNSUPPORTED;
-
 	fops = __efivars->ops;
 
 	if (!fops->query_variable_store)
@@ -313,15 +309,12 @@ check_var_size(u32 attributes, unsigned long size)
 
 	return fops->query_variable_store(attributes, size, false);
 }
+EXPORT_SYMBOL_NS_GPL(check_var_size, EFIVAR);
 
-static efi_status_t
-check_var_size_nonblocking(u32 attributes, unsigned long size)
+efi_status_t check_var_size_nonblocking(u32 attributes, unsigned long size)
 {
 	const struct efivar_operations *fops;
 
-	if (!__efivars)
-		return EFI_UNSUPPORTED;
-
 	fops = __efivars->ops;
 
 	if (!fops->query_variable_store)
@@ -329,6 +322,7 @@ check_var_size_nonblocking(u32 attributes, unsigned long size)
 
 	return fops->query_variable_store(attributes, size, true);
 }
+EXPORT_SYMBOL_NS_GPL(check_var_size_nonblocking, EFIVAR);
 
 static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor,
 				struct list_head *head)
@@ -450,9 +444,6 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
 						&vendor_guid);
 		switch (status) {
 		case EFI_SUCCESS:
-			if (duplicates)
-				up(&efivars_lock);
-
 			variable_name_size = var_name_strnsize(variable_name,
 							       variable_name_size);
 
@@ -476,14 +467,6 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
 				if (err)
 					status = EFI_NOT_FOUND;
 			}
-
-			if (duplicates) {
-				if (down_interruptible(&efivars_lock)) {
-					err = -EINTR;
-					goto free;
-				}
-			}
-
 			break;
 		case EFI_UNSUPPORTED:
 			err = -EOPNOTSUPP;
@@ -526,20 +509,24 @@ int efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
 }
 EXPORT_SYMBOL_GPL(efivar_entry_add);
 
+/**
+ * __efivar_entry_add - add entry to variable list
+ * @entry: entry to add to list
+ * @head: list head
+ */
+void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
+{
+	list_add(&entry->list, head);
+}
+EXPORT_SYMBOL_GPL(__efivar_entry_add);
+
 /**
  * efivar_entry_remove - remove entry from variable list
  * @entry: entry to remove from list
- *
- * Returns 0 on success, or a kernel error code on failure.
  */
-int efivar_entry_remove(struct efivar_entry *entry)
+void efivar_entry_remove(struct efivar_entry *entry)
 {
-	if (down_interruptible(&efivars_lock))
-		return -EINTR;
 	list_del(&entry->list);
-	up(&efivars_lock);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(efivar_entry_remove);
 
@@ -827,16 +814,8 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
 	if (!found)
 		return NULL;
 
-	if (remove) {
-		if (entry->scanning) {
-			/*
-			 * The entry will be deleted
-			 * after scanning is completed.
-			 */
-			entry->deleting = true;
-		} else
-			list_del(&entry->list);
-	}
+	if (remove)
+		list_del(&entry->list);
 
 	return entry;
 }
@@ -1055,59 +1034,6 @@ void efivar_entry_iter_end(void)
 }
 EXPORT_SYMBOL_GPL(efivar_entry_iter_end);
 
-/**
- * __efivar_entry_iter - iterate over variable list
- * @func: callback function
- * @head: head of the variable list
- * @data: function-specific data to pass to callback
- * @prev: entry to begin iterating from
- *
- * Iterate over the list of EFI variables and call @func with every
- * entry on the list. It is safe for @func to remove entries in the
- * list via efivar_entry_delete().
- *
- * You MUST call efivar_entry_iter_begin() before this function, and
- * efivar_entry_iter_end() afterwards.
- *
- * It is possible to begin iteration from an arbitrary entry within
- * the list by passing @prev. @prev is updated on return to point to
- * the last entry passed to @func. To begin iterating from the
- * beginning of the list @prev must be %NULL.
- *
- * The restrictions for @func are the same as documented for
- * efivar_entry_iter().
- */
-int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
-			struct list_head *head, void *data,
-			struct efivar_entry **prev)
-{
-	struct efivar_entry *entry, *n;
-	int err = 0;
-
-	if (!prev || !*prev) {
-		list_for_each_entry_safe(entry, n, head, list) {
-			err = func(entry, data);
-			if (err)
-				break;
-		}
-
-		if (prev)
-			*prev = entry;
-
-		return err;
-	}
-
-
-	list_for_each_entry_safe_continue((*prev), n, head, list) {
-		err = func(*prev, data);
-		if (err)
-			break;
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(__efivar_entry_iter);
-
 /**
  * efivar_entry_iter - iterate over variable list
  * @func: callback function
@@ -1125,12 +1051,18 @@ EXPORT_SYMBOL_GPL(__efivar_entry_iter);
 int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
 		      struct list_head *head, void *data)
 {
+	struct efivar_entry *entry, *n;
 	int err = 0;
 
 	err = efivar_entry_iter_begin();
 	if (err)
 		return err;
-	err = __efivar_entry_iter(func, head, data, NULL);
+
+	list_for_each_entry_safe(entry, n, head, list) {
+		err = func(entry, data);
+		if (err)
+			break;
+	}
 	efivar_entry_iter_end();
 
 	return err;
@@ -1220,3 +1152,143 @@ int efivar_supports_writes(void)
 	return __efivars && __efivars->ops->set_variable;
 }
 EXPORT_SYMBOL_GPL(efivar_supports_writes);
+
+/*
+ * efivar_lock() - obtain the efivar lock, wait for it if needed
+ * @return 0 on success, error code on failure
+ */
+int efivar_lock(void)
+{
+	if (down_interruptible(&efivars_lock))
+		return -EINTR;
+	if (!__efivars->ops) {
+		up(&efivars_lock);
+		return -ENODEV;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(efivar_lock, EFIVAR);
+
+/*
+ * efivar_lock() - obtain the efivar lock if it is free
+ * @return 0 on success, error code on failure
+ */
+int efivar_trylock(void)
+{
+	if (down_trylock(&efivars_lock))
+		 return -EBUSY;
+	if (!__efivars->ops) {
+		up(&efivars_lock);
+		return -ENODEV;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(efivar_trylock, EFIVAR);
+
+/*
+ * efivar_unlock() - release the efivar lock
+ */
+void efivar_unlock(void)
+{
+	up(&efivars_lock);
+}
+EXPORT_SYMBOL_NS_GPL(efivar_unlock, EFIVAR);
+
+/*
+ * efivar_get_variable() - retrieve a variable identified by name/vendor
+ *
+ * Must be called with efivars_lock held.
+ */
+efi_status_t efivar_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+				 u32 *attr, unsigned long *size, void *data)
+{
+	return __efivars->ops->get_variable(name, vendor, attr, size, data);
+}
+EXPORT_SYMBOL_NS_GPL(efivar_get_variable, EFIVAR);
+
+/*
+ * efivar_get_next_variable() - enumerate the next name/vendor pair
+ *
+ * Must be called with efivars_lock held.
+ */
+efi_status_t efivar_get_next_variable(unsigned long *name_size,
+				      efi_char16_t *name, efi_guid_t *vendor)
+{
+	return __efivars->ops->get_next_variable(name_size, name, vendor);
+}
+EXPORT_SYMBOL_NS_GPL(efivar_get_next_variable, EFIVAR);
+
+/*
+ * efivar_set_variable_blocking() - local helper function for set_variable
+ *
+ * Must be called with efivars_lock held.
+ */
+static efi_status_t
+efivar_set_variable_blocking(efi_char16_t *name, efi_guid_t *vendor,
+			     u32 attr, unsigned long data_size, void *data)
+{
+	efi_status_t status;
+
+	if (data_size > 0) {
+		status = check_var_size(attr, data_size +
+					      ucs2_strsize(name, 1024));
+		if (status != EFI_SUCCESS)
+			return status;
+	}
+	return __efivars->ops->set_variable(name, vendor, attr, data_size, data);
+}
+
+/*
+ * efivar_set_variable_locked() - set a variable identified by name/vendor
+ *
+ * Must be called with efivars_lock held. If @nonblocking is set, it will use
+ * non-blocking primitives so it is guaranteed not to sleep.
+ */
+efi_status_t efivar_set_variable_locked(efi_char16_t *name, efi_guid_t *vendor,
+					u32 attr, unsigned long data_size,
+					void *data, bool nonblocking)
+{
+	efi_set_variable_t *setvar;
+	efi_status_t status;
+
+	if (!nonblocking)
+		return efivar_set_variable_blocking(name, vendor, attr,
+						    data_size, data);
+
+	/*
+	 * If no _nonblocking variant exists, the ordinary one
+	 * is assumed to be non-blocking.
+	 */
+	setvar = __efivars->ops->set_variable_nonblocking ?:
+		 __efivars->ops->set_variable;
+
+	if (data_size > 0) {
+		status = check_var_size_nonblocking(attr, data_size +
+							  ucs2_strsize(name, 1024));
+		if (status != EFI_SUCCESS)
+			return status;
+	}
+	return setvar(name, vendor, attr, data_size, data);
+}
+EXPORT_SYMBOL_NS_GPL(efivar_set_variable_locked, EFIVAR);
+
+/*
+ * efivar_set_variable() - set a variable identified by name/vendor
+ *
+ * Can be called without holding the efivars_lock. Will sleep on obtaining the
+ * lock, or on obtaining other locks that are needed in order to complete the
+ * call.
+ */
+efi_status_t efivar_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+				 u32 attr, unsigned long data_size, void *data)
+{
+	efi_status_t status;
+
+	if (efivar_lock())
+		return EFI_ABORTED;
+
+	status = efivar_set_variable_blocking(name, vendor, attr, data_size, data);
+	efivar_unlock();
+	return status;
+}
+EXPORT_SYMBOL_NS_GPL(efivar_set_variable, EFIVAR);

drivers/input/keyboard/applespi.c

@@ -1597,52 +1597,38 @@ static u32 applespi_notify(acpi_handle gpe_device, u32 gpe, void *context)
 
 static int applespi_get_saved_bl_level(struct applespi_data *applespi)
 {
-	struct efivar_entry *efivar_entry;
+	efi_status_t sts = EFI_NOT_FOUND;
 	u16 efi_data = 0;
-	unsigned long efi_data_len;
-	int sts;
-
-	efivar_entry = kmalloc(sizeof(*efivar_entry), GFP_KERNEL);
-	if (!efivar_entry)
-		return -ENOMEM;
-
-	memcpy(efivar_entry->var.VariableName, EFI_BL_LEVEL_NAME,
-	       sizeof(EFI_BL_LEVEL_NAME));
-	efivar_entry->var.VendorGuid = EFI_BL_LEVEL_GUID;
-	efi_data_len = sizeof(efi_data);
+	unsigned long efi_data_len = sizeof(efi_data);
 
-	sts = efivar_entry_get(efivar_entry, NULL, &efi_data_len, &efi_data);
-	if (sts && sts != -ENOENT)
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		sts = efi.get_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
+				       NULL, &efi_data_len, &efi_data);
+	if (sts != EFI_SUCCESS && sts != EFI_NOT_FOUND)
 		dev_warn(&applespi->spi->dev,
-			 "Error getting backlight level from EFI vars: %d\n",
+			 "Error getting backlight level from EFI vars: 0x%lx\n",
 			 sts);
 
-	kfree(efivar_entry);
-
-	return sts ? sts : efi_data;
+	return sts != EFI_SUCCESS ? -ENODEV : efi_data;
 }
 
 static void applespi_save_bl_level(struct applespi_data *applespi,
 				   unsigned int level)
 {
-	efi_guid_t efi_guid;
+	efi_status_t sts = EFI_UNSUPPORTED;
 	u32 efi_attr;
-	unsigned long efi_data_len;
 	u16 efi_data;
-	int sts;
 
-	/* Save keyboard backlight level */
-	efi_guid = EFI_BL_LEVEL_GUID;
 	efi_data = (u16)level;
-	efi_data_len = sizeof(efi_data);
 	efi_attr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS |
 		   EFI_VARIABLE_RUNTIME_ACCESS;
 
-	sts = efivar_entry_set_safe((efi_char16_t *)EFI_BL_LEVEL_NAME, efi_guid,
-				    efi_attr, true, efi_data_len, &efi_data);
-	if (sts)
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
+		sts = efi.set_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
+				       efi_attr, sizeof(efi_data), &efi_data);
+	if (sts != EFI_SUCCESS)
 		dev_warn(&applespi->spi->dev,
-			 "Error saving backlight level to EFI vars: %d\n", sts);
+			 "Error saving backlight level to EFI vars: 0x%lx\n", sts);
 }
 
 static int applespi_probe(struct spi_device *spi)

drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c

@@ -459,43 +459,34 @@ static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len)
 
 static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret)
 {
-	const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 };
-	struct efivar_entry *nvram_efivar;
+	efi_guid_t guid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61, 0xb5, 0x1f,
+				   0x43, 0x26, 0x81, 0x23, 0xd1, 0x13);
 	unsigned long data_len = 0;
+	efi_status_t status;
 	u8 *data = NULL;
-	int err;
 
-	nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL);
-	if (!nvram_efivar)
+	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
 		return NULL;
 
-	memcpy(&nvram_efivar->var.VariableName, name, sizeof(name));
-	nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61,
-						0xb5, 0x1f, 0x43, 0x26,
-						0x81, 0x23, 0xd1, 0x13);
-
-	err = efivar_entry_size(nvram_efivar, &data_len);
-	if (err)
+	status = efi.get_variable(L"nvram", &guid, NULL, &data_len, NULL);
+	if (status != EFI_BUFFER_TOO_SMALL)
 		goto fail;
 
 	data = kmalloc(data_len, GFP_KERNEL);
 	if (!data)
 		goto fail;
 
-	err = efivar_entry_get(nvram_efivar, NULL, &data_len, data);
-	if (err)
+	status = efi.get_variable(L"nvram", &guid, NULL, &data_len, data);
+	if (status != EFI_SUCCESS)
 		goto fail;
 
 	brcmf_fw_fix_efi_nvram_ccode(data, data_len);
 	brcmf_info("Using nvram EFI variable\n");
 
-	kfree(nvram_efivar);
 	*data_len_ret = data_len;
 	return data;
-
 fail:
 	kfree(data);
-	kfree(nvram_efivar);
 	return NULL;
 }
 #else

drivers/net/wireless/intel/iwlwifi/fw/uefi.c

@@ -19,20 +19,14 @@
 
 void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
 {
-	struct efivar_entry *pnvm_efivar;
 	void *data;
 	unsigned long package_size;
-	int err;
+	efi_status_t status;
 
 	*len = 0;
 
-	pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL);
-	if (!pnvm_efivar)
-		return ERR_PTR(-ENOMEM);
-
-	memcpy(&pnvm_efivar->var.VariableName, IWL_UEFI_OEM_PNVM_NAME,
-	       sizeof(IWL_UEFI_OEM_PNVM_NAME));
-	pnvm_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
+	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		return ERR_PTR(-ENODEV);
 
 	/*
 	 * TODO: we hardcode a maximum length here, because reading
@@ -42,27 +36,22 @@ void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
 	package_size = IWL_HARDCODED_PNVM_SIZE;
 
 	data = kmalloc(package_size, GFP_KERNEL);
-	if (!data) {
-		data = ERR_PTR(-ENOMEM);
-		goto out;
-	}
+	if (!data)
+		return ERR_PTR(-ENOMEM);
 
-	err = efivar_entry_get(pnvm_efivar, NULL, &package_size, data);
-	if (err) {
+	status = efi.get_variable(IWL_UEFI_OEM_PNVM_NAME, &IWL_EFI_VAR_GUID,
+				  NULL, &package_size, data);
+	if (status != EFI_SUCCESS) {
 		IWL_DEBUG_FW(trans,
-			     "PNVM UEFI variable not found %d (len %lu)\n",
-			     err, package_size);
+			     "PNVM UEFI variable not found 0x%lx (len %lu)\n",
+			     status, package_size);
 		kfree(data);
-		data = ERR_PTR(err);
-		goto out;
+		return ERR_PTR(-ENOENT);
 	}
 
 	IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size);
 	*len = package_size;
 
-out:
-	kfree(pnvm_efivar);
-
 	return data;
 }
 
@@ -211,21 +200,15 @@ static void *iwl_uefi_reduce_power_parse(struct iwl_trans *trans,
 
 void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
 {
-	struct efivar_entry *reduce_power_efivar;
 	struct pnvm_sku_package *package;
 	void *data = NULL;
 	unsigned long package_size;
-	int err;
+	efi_status_t status;
 
 	*len = 0;
 
-	reduce_power_efivar = kzalloc(sizeof(*reduce_power_efivar), GFP_KERNEL);
-	if (!reduce_power_efivar)
-		return ERR_PTR(-ENOMEM);
-
-	memcpy(&reduce_power_efivar->var.VariableName, IWL_UEFI_REDUCED_POWER_NAME,
-	       sizeof(IWL_UEFI_REDUCED_POWER_NAME));
-	reduce_power_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
+	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		return ERR_PTR(-ENODEV);
 
 	/*
 	 * TODO: we hardcode a maximum length here, because reading
@@ -235,19 +218,17 @@ void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
 	package_size = IWL_HARDCODED_REDUCE_POWER_SIZE;
 
 	package = kmalloc(package_size, GFP_KERNEL);
-	if (!package) {
-		package = ERR_PTR(-ENOMEM);
-		goto out;
-	}
+	if (!package)
+		return ERR_PTR(-ENOMEM);
 
-	err = efivar_entry_get(reduce_power_efivar, NULL, &package_size, package);
-	if (err) {
+	status = efi.get_variable(IWL_UEFI_REDUCED_POWER_NAME, &IWL_EFI_VAR_GUID,
+				  NULL, &package_size, data);
+	if (status != EFI_SUCCESS) {
 		IWL_DEBUG_FW(trans,
-			     "Reduced Power UEFI variable not found %d (len %lu)\n",
-			     err, package_size);
+			     "Reduced Power UEFI variable not found 0x%lx (len %lu)\n",
+			     status, package_size);
 		kfree(package);
-		data = ERR_PTR(err);
-		goto out;
+		return ERR_PTR(-ENOENT);
 	}
 
 	IWL_DEBUG_FW(trans, "Read reduced power from UEFI with size %lu\n",
@@ -262,9 +243,6 @@ void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
 
 	kfree(package);
 
-out:
-	kfree(reduce_power_efivar);
-
 	return data;
 }
 
@@ -304,22 +282,15 @@ static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data,
 void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
 			     struct iwl_fw_runtime *fwrt)
 {
-	struct efivar_entry *sgom_efivar;
 	struct uefi_cnv_wlan_sgom_data *data;
 	unsigned long package_size;
-	int err, ret;
-
-	if (!fwrt->geo_enabled)
-		return;
+	efi_status_t status;
+	int ret;
 
-	sgom_efivar = kzalloc(sizeof(*sgom_efivar), GFP_KERNEL);
-	if (!sgom_efivar)
+	if (!fwrt->geo_enabled ||
+	    !efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
 		return;
 
-	memcpy(&sgom_efivar->var.VariableName, IWL_UEFI_SGOM_NAME,
-	       sizeof(IWL_UEFI_SGOM_NAME));
-	sgom_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
-
 	/* TODO: we hardcode a maximum length here, because reading
 	 * from the UEFI is not working.  To implement this properly,
 	 * we have to call efivar_entry_size().
@@ -327,15 +298,14 @@ void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
 	package_size = IWL_HARDCODED_SGOM_SIZE;
 
 	data = kmalloc(package_size, GFP_KERNEL);
-	if (!data) {
-		data = ERR_PTR(-ENOMEM);
-		goto out;
-	}
+	if (!data)
+		return;
 
-	err = efivar_entry_get(sgom_efivar, NULL, &package_size, data);
-	if (err) {
+	status = efi.get_variable(IWL_UEFI_SGOM_NAME, &IWL_EFI_VAR_GUID,
+				  NULL, &package_size, data);
+	if (status != EFI_SUCCESS) {
 		IWL_DEBUG_FW(trans,
-			     "SGOM UEFI variable not found %d\n", err);
+			     "SGOM UEFI variable not found 0x%lx\n", status);
 		goto out_free;
 	}
 
@@ -349,8 +319,6 @@ void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
 out_free:
 	kfree(data);
 
-out:
-	kfree(sgom_efivar);
 }
 IWL_EXPORT_SYMBOL(iwl_uefi_get_sgom_table);
 #endif /* CONFIG_ACPI */

drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c

@@ -1284,7 +1284,7 @@ static int gmin_get_config_var(struct device *maindev,
 	const struct dmi_system_id *id;
 	struct device *dev = maindev;
 	char var8[CFG_VAR_NAME_MAX];
-	struct efivar_entry *ev;
+	efi_status_t status;
 	int i, ret;
 
 	/* For sensors, try first to use the _DSM table */
@@ -1326,24 +1326,11 @@ static int gmin_get_config_var(struct device *maindev,
 	for (i = 0; i < sizeof(var8) && var8[i]; i++)
 		var16[i] = var8[i];
 
-	/* Not sure this API usage is kosher; efivar_entry_get()'s
-	 * implementation simply uses VariableName and VendorGuid from
-	 * the struct and ignores the rest, but it seems like there
-	 * ought to be an "official" efivar_entry registered
-	 * somewhere?
-	 */
-	ev = kzalloc(sizeof(*ev), GFP_KERNEL);
-	if (!ev)
-		return -ENOMEM;
-	memcpy(&ev->var.VariableName, var16, sizeof(var16));
-	ev->var.VendorGuid = GMIN_CFG_VAR_EFI_GUID;
-	ev->var.DataSize = *out_len;
-
-	ret = efivar_entry_get(ev, &ev->var.Attributes,
-			       &ev->var.DataSize, ev->var.Data);
-	if (ret == 0) {
-		memcpy(out, ev->var.Data, ev->var.DataSize);
-		*out_len = ev->var.DataSize;
+	status = EFI_UNSUPPORTED;
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		status = efi.get_variable(var16, &GMIN_CFG_VAR_EFI_GUID, NULL,
+					  (unsigned long *)out_len, out);
+	if (status == EFI_SUCCESS) {
 		dev_info(maindev, "found EFI entry for '%s'\n", var8);
 	} else if (is_gmin) {
 		dev_info(maindev, "Failed to find EFI gmin variable %s\n", var8);
@@ -1351,8 +1338,6 @@ static int gmin_get_config_var(struct device *maindev,
 		dev_info(maindev, "Failed to find EFI variable %s\n", var8);
 	}
 
-	kfree(ev);
-
 	return ret;
 }
 

fs/efivarfs/super.c

@@ -155,10 +155,8 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
 		goto fail_inode;
 	}
 
-	efivar_entry_size(entry, &size);
-	err = efivar_entry_add(entry, &efivarfs_list);
-	if (err)
-		goto fail_inode;
+	__efivar_entry_get(entry, NULL, &size, NULL);
+	__efivar_entry_add(entry, &efivarfs_list);
 
 	/* copied by the above to local storage in the dentry. */
 	kfree(name);
@@ -182,10 +180,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
 
 static int efivarfs_destroy(struct efivar_entry *entry, void *data)
 {
-	int err = efivar_entry_remove(entry);
-
-	if (err)
-		return err;
+	efivar_entry_remove(entry);
 	kfree(entry);
 	return 0;
 }
@@ -221,7 +216,7 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	err = efivar_init(efivarfs_callback, (void *)sb, true, &efivarfs_list);
 	if (err)
-		__efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
+		efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL);
 
 	return err;
 }
@@ -246,7 +241,7 @@ static void efivarfs_kill_sb(struct super_block *sb)
 	kill_litter_super(sb);
 
 	/* Remove all entries and destroy */
-	__efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
+	efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL);
 }
 
 static struct file_system_type efivarfs_type = {

fs/pstore/inode.c

@@ -55,6 +55,7 @@ static void free_pstore_private(struct pstore_private *private)
 		return;
 	if (private->record) {
 		kfree(private->record->buf);
+		kfree(private->record->priv);
 		kfree(private->record);
 	}
 	kfree(private);

fs/pstore/platform.c

@@ -808,6 +808,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
 		if (rc) {
 			/* pstore_mkfile() did not take record, so free it. */
 			kfree(record->buf);
+			kfree(record->priv);
 			kfree(record);
 			if (rc != -EEXIST || !quiet)
 				failed++;

include/linux/efi.h

@@ -872,6 +872,7 @@ static inline bool efi_rt_services_supported(unsigned int mask)
 {
 	return (efi.runtime_supported_mask & mask) == mask;
 }
+extern void efi_find_mirror(void);
 #else
 static inline bool efi_enabled(int feature)
 {
@@ -889,6 +890,8 @@ static inline bool efi_rt_services_supported(unsigned int mask)
 {
 	return false;
 }
+
+static inline void efi_find_mirror(void) {}
 #endif
 
 extern int efi_status_to_err(efi_status_t status);
@@ -1040,8 +1043,6 @@ struct efivar_entry {
 	struct efi_variable var;
 	struct list_head list;
 	struct kobject kobj;
-	bool scanning;
-	bool deleting;
 };
 
 static inline void
@@ -1061,7 +1062,8 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
 		void *data, bool duplicates, struct list_head *head);
 
 int efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
-int efivar_entry_remove(struct efivar_entry *entry);
+void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
+void efivar_entry_remove(struct efivar_entry *entry);
 
 int __efivar_entry_delete(struct efivar_entry *entry);
 int efivar_entry_delete(struct efivar_entry *entry);
@@ -1081,9 +1083,6 @@ int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
 int efivar_entry_iter_begin(void);
 void efivar_entry_iter_end(void);
 
-int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
-			struct list_head *head, void *data,
-			struct efivar_entry **prev);
 int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
 		      struct list_head *head, void *data);
 
@@ -1095,6 +1094,26 @@ bool efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
 bool efivar_variable_is_removable(efi_guid_t vendor, const char *name,
 				  size_t len);
 
+int efivar_lock(void);
+int efivar_trylock(void);
+void efivar_unlock(void);
+
+efi_status_t efivar_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+				 u32 *attr, unsigned long *size, void *data);
+
+efi_status_t efivar_get_next_variable(unsigned long *name_size,
+				      efi_char16_t *name, efi_guid_t *vendor);
+
+efi_status_t efivar_set_variable_locked(efi_char16_t *name, efi_guid_t *vendor,
+					u32 attr, unsigned long data_size,
+					void *data, bool nonblocking);
+
+efi_status_t efivar_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+				 u32 attr, unsigned long data_size, void *data);
+
+efi_status_t check_var_size(u32 attributes, unsigned long size);
+efi_status_t check_var_size_nonblocking(u32 attributes, unsigned long size);
+
 #if IS_ENABLED(CONFIG_EFI_CAPSULE_LOADER)
 extern bool efi_capsule_pending(int *reset_type);
 
@@ -1181,6 +1200,8 @@ static inline void efi_check_for_embedded_firmwares(void) { }
 
 efi_status_t efi_random_get_seed(void);
 
+#define arch_efi_call_virt(p, f, args...)	((p)->f(args))
+
 /*
  * Arch code can implement the following three template macros, avoiding
  * reptition for the void/non-void return cases of {__,}efi_call_virt():

include/linux/pstore.h

@@ -57,6 +57,9 @@ struct pstore_info;
  * @size:	size of @buf
  * @ecc_notice_size:
  *		ECC information for @buf
+ * @priv:	pointer for backend specific use, will be
+ *		kfree()d by the pstore core if non-NULL
+ *		when the record is freed.
  *
  * Valid for PSTORE_TYPE_DMESG @type:
  *
@@ -74,6 +77,7 @@ struct pstore_record {
 	char			*buf;
 	ssize_t			size;
 	ssize_t			ecc_notice_size;
+	void			*priv;
 
 	int			count;
 	enum kmsg_dump_reason	reason;

mm/internal.h

@@ -861,4 +861,6 @@ struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags);
 
 DECLARE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
 
+extern bool mirrored_kernelcore;
+
 #endif	/* __MM_INTERNAL_H */

mm/memblock.c

@@ -327,7 +327,7 @@ static phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
 					    NUMA_NO_NODE, flags);
 
 	if (!ret && (flags & MEMBLOCK_MIRROR)) {
-		pr_warn("Could not allocate %pap bytes of mirrored memory\n",
+		pr_warn_ratelimited("Could not allocate %pap bytes of mirrored memory\n",
 			&size);
 		flags &= ~MEMBLOCK_MIRROR;
 		goto again;
@@ -924,6 +924,9 @@ int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size)
  */
 int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
 {
+	if (!mirrored_kernelcore)
+		return 0;
+
 	system_has_some_mirror = true;
 
 	return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR);
@@ -1384,7 +1387,7 @@ phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
 
 	if (flags & MEMBLOCK_MIRROR) {
 		flags &= ~MEMBLOCK_MIRROR;
-		pr_warn("Could not allocate %pap bytes of mirrored memory\n",
+		pr_warn_ratelimited("Could not allocate %pap bytes of mirrored memory\n",
 			&size);
 		goto again;
 	}

mm/page_alloc.c

@@ -356,7 +356,7 @@ static unsigned long required_kernelcore_percent __initdata;
 static unsigned long required_movablecore __initdata;
 static unsigned long required_movablecore_percent __initdata;
 static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata;
-static bool mirrored_kernelcore __meminitdata;
+bool mirrored_kernelcore __initdata_memblock;
 
 /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
 int movable_zone;

mm/sparse-vmemmap.c

@@ -536,7 +536,7 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
 	int actual_node = early_pfn_to_nid(pfn);
 
 	if (node_distance(actual_node, node) > LOCAL_DISTANCE)
-		pr_warn("[%lx-%lx] potential offnode page_structs\n",
+		pr_warn_once("[%lx-%lx] potential offnode page_structs\n",
 			start, end - 1);
 }
 

tools/testing/selftests/kexec/kexec_common_lib.sh

@@ -65,32 +65,6 @@ get_efivarfs_secureboot_mode()
 	return 0;
 }
 
-get_efi_var_secureboot_mode()
-{
-	local efi_vars
-	local secure_boot_file
-	local setup_mode_file
-	local secureboot_mode
-	local setup_mode
-
-	if [ ! -d "$efi_vars" ]; then
-		log_skip "efi_vars is not enabled\n"
-	fi
-	secure_boot_file=$(find "$efi_vars" -name SecureBoot-* 2>/dev/null)
-	setup_mode_file=$(find "$efi_vars" -name SetupMode-* 2>/dev/null)
-	if [ -f "$secure_boot_file/data" ] && \
-	   [ -f "$setup_mode_file/data" ]; then
-		secureboot_mode=`od -An -t u1 "$secure_boot_file/data"`
-		setup_mode=`od -An -t u1 "$setup_mode_file/data"`
-
-		if [ $secureboot_mode -eq 1 ] && [ $setup_mode -eq 0 ]; then
-			log_info "secure boot mode enabled (CONFIG_EFI_VARS)"
-			return 1;
-		fi
-	fi
-	return 0;
-}
-
 # On powerpc platform, check device-tree property
 # /proc/device-tree/ibm,secureboot/os-secureboot-enforcing
 # to detect secureboot state.
@@ -113,9 +87,8 @@ get_arch()
 }
 
 # Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID).
-# The secure boot mode can be accessed either as the last integer
-# of "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*" or from
-# "od -An -t u1 /sys/firmware/efi/vars/SecureBoot-*/data".  The efi
+# The secure boot mode can be accessed as the last integer of
+# "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*".  The efi
 # SetupMode can be similarly accessed.
 # Return 1 for SecureBoot mode enabled and SetupMode mode disabled.
 get_secureboot_mode()
@@ -129,11 +102,6 @@ get_secureboot_mode()
 	else
 		get_efivarfs_secureboot_mode
 		secureboot_mode=$?
-		# fallback to using the efi_var files
-		if [ $secureboot_mode -eq 0 ]; then
-			get_efi_var_secureboot_mode
-			secureboot_mode=$?
-		fi
 	fi
 
 	if [ $secureboot_mode -eq 0 ]; then