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Subject[PATCH 48/50] efivars: Expose efivars functionality to external drivers.
Date
From: Mike Waychison <mikew@google.com>

Signed-off-by: Mike Waychison <mikew@google.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>,
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/firmware/efivars.c | 34 +++++++---------------------------
include/linux/efi.h | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+), 27 deletions(-)

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index b10b7d7..ff0c373 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -89,28 +89,6 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables");
MODULE_LICENSE("GPL");
MODULE_VERSION(EFIVARS_VERSION);

-struct efivar_operations {
- efi_get_variable_t *get_variable;
- efi_get_next_variable_t *get_next_variable;
- efi_set_variable_t *set_variable;
-};
-
-struct efivars {
- /*
- * ->lock protects two things:
- * 1) ->list - adds, removals, reads, writes
- * 2) ops.[gs]et_variable() calls.
- * It must not be held when creating sysfs entries or calling kmalloc.
- * ops.get_next_variable() is only called from register_efivars(),
- * which is protected by the BKL, so that path is safe.
- */
- spinlock_t lock;
- struct list_head list;
- struct kset *kset;
- struct bin_attribute *new_var, *del_var;
- const struct efivar_operations *ops;
-};
-
/*
* The maximum size of VariableName + Data = 1024
* Therefore, it's reasonable to save that much
@@ -706,7 +684,7 @@ out_free:
return error;
}

-static void unregister_efivars(struct efivars *efivars)
+void unregister_efivars(struct efivars *efivars)
{
struct efivar_entry *entry, *n;

@@ -724,10 +702,11 @@ static void unregister_efivars(struct efivars *efivars)
kfree(efivars->del_var);
kset_unregister(efivars->kset);
}
+EXPORT_SYMBOL_GPL(unregister_efivars);

-static int register_efivars(struct efivars *efivars,
- const struct efivar_operations *ops,
- struct kobject *parent_kobj)
+int register_efivars(struct efivars *efivars,
+ const struct efivar_operations *ops,
+ struct kobject *parent_kobj)
{
efi_status_t status = EFI_NOT_FOUND;
efi_guid_t vendor_guid;
@@ -789,6 +768,7 @@ out:

return error;
}
+EXPORT_SYMBOL_GPL(register_efivars);

static struct efivars __efivars;
static struct efivar_operations ops;
@@ -810,7 +790,7 @@ efivars_init(void)
EFIVARS_DATE);

if (!efi_enabled)
- return -ENODEV;
+ return 0;

/* For now we'll register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
diff --git a/include/linux/efi.h b/include/linux/efi.h
index fb737bc..33fa120 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -397,4 +397,41 @@ 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.
+ *
+ * Different firmware drivers can expose their EFI-like variables using
+ * the following.
+ */
+
+struct efivar_operations {
+ efi_get_variable_t *get_variable;
+ efi_get_next_variable_t *get_next_variable;
+ efi_set_variable_t *set_variable;
+};
+
+struct efivars {
+ /*
+ * ->lock protects two things:
+ * 1) ->list - adds, removals, reads, writes
+ * 2) ops.[gs]et_variable() calls.
+ * It must not be held when creating sysfs entries or calling kmalloc.
+ * ops.get_next_variable() is only called from register_efivars(),
+ * which is protected by the BKL, so that path is safe.
+ */
+ spinlock_t lock;
+ struct list_head list;
+ struct kset *kset;
+ struct bin_attribute *new_var, *del_var;
+ const struct efivar_operations *ops;
+};
+
+int register_efivars(struct efivars *efivars,
+ const struct efivar_operations *ops,
+ struct kobject *parent_kobj);
+void unregister_efivars(struct efivars *efivars);
+
+#endif /* CONFIG_EFI_VARS */
+
#endif /* _LINUX_EFI_H */
--
1.7.4.1


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