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

Pull x86/efi changes from Peter Anvin:
 "The bulk of these changes are cleaning up the efivars handling and
  breaking it up into a tree of files.  There are a number of fixes as
  well.

  The entire changeset is pretty big, but most of it is code movement.

  Several of these commits are quite new; the history got very messed up
  due to a mismerge with the urgent changes for rc8 which completely
  broke IA64, and so Ingo requested that we rebase it to straighten it
  out."

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: remove "kfree(NULL)"
  efi: locking fix in efivar_entry_set_safe()
  efi, pstore: Read data from variable store before memcpy()
  efi, pstore: Remove entry from list when erasing
  efi, pstore: Initialise 'entry' before iterating
  efi: split efisubsystem from efivars
  efivarfs: Move to fs/efivarfs
  efivars: Move pstore code into the new EFI directory
  efivars: efivar_entry API
  efivars: Keep a private global pointer to efivars
  efi: move utf16 string functions to efi.h
  x86, efi: Make efi_memblock_x86_reserve_range more readable
  efivarfs: convert to use simple_open()

1 files changed, 82 insertions, 8 deletions

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 3d7df3d32c66..2bc0ad78d058 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -670,6 +670,12 @@ static inline int efi_enabled(int facility)
                                 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
                                 EFI_VARIABLE_APPEND_WRITE)
 /*
+ * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
+ * not including trailing NUL
+ */
+#define EFI_VARIABLE_GUID_LEN 36
+
+/*
  * The type of search to perform when calling boottime->locate_handle
  */
 #define EFI_LOCATE_ALL_HANDLES                  0
@@ -726,7 +732,6 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
         *addr &= PAGE_MASK;
 }
 
-#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
 /*
  * EFI Variable support.
  *
@@ -752,19 +757,88 @@ struct efivars {
          * which is protected by the BKL, so that path is safe.
          */
         spinlock_t lock;
-        struct list_head list;
         struct kset *kset;
         struct kobject *kobject;
-        struct bin_attribute *new_var, *del_var;
         const struct efivar_operations *ops;
-        struct efivar_entry *walk_entry;
-        struct pstore_info efi_pstore_info;
 };
 
-int register_efivars(struct efivars *efivars,
+/*
+ * The maximum size of VariableName + Data = 1024
+ * Therefore, it's reasonable to save that much
+ * space in each part of the structure,
+ * and we use a page for reading/writing.
+ */
+
+struct efi_variable {
+        efi_char16_t  VariableName[1024/sizeof(efi_char16_t)];
+        efi_guid_t    VendorGuid;
+        unsigned long DataSize;
+        __u8          Data[1024];
+        efi_status_t  Status;
+        __u32         Attributes;
+} __attribute__((packed));
+
+struct efivar_entry {
+        struct efi_variable var;
+        struct list_head list;
+        struct kobject kobj;
+};
+
+extern struct list_head efivar_sysfs_list;
+
+static inline void
+efivar_unregister(struct efivar_entry *var)
+{
+        kobject_put(&var->kobj);
+}
+
+int efivars_register(struct efivars *efivars,
                      const struct efivar_operations *ops,
-                     struct kobject *parent_kobj);
-void unregister_efivars(struct efivars *efivars);
+                     struct kobject *kobject);
+int efivars_unregister(struct efivars *efivars);
+struct kobject *efivars_kobject(void);
+
+int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
+                void *data, bool atomic, bool duplicates,
+                struct list_head *head);
+
+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);
+
+int efivar_entry_size(struct efivar_entry *entry, unsigned long *size);
+int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
+                       unsigned long *size, void *data);
+int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
+                     unsigned long *size, void *data);
+int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
+                     unsigned long size, void *data, struct list_head *head);
+int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
+                              unsigned long *size, void *data, bool *set);
+int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
+                          bool block, unsigned long size, void *data);
+
+void 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);
+
+struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
+                                       struct list_head *head, bool remove);
+
+bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
+
+extern struct work_struct efivar_work;
+void efivar_run_worker(void);
+
+#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
+int efivars_sysfs_init(void);
 
 #endif /* CONFIG_EFI_VARS */