Resolve conflicts for Ingo.
Conflicts:
drivers/firmware/Kconfig
drivers/firmware/efivars.c
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
config EFI
bool
++ select UCS2_STRING
default y
config SCHED_OMIT_FRAME_POINTER
--- /dev/null
- unsigned long utf16_len = utf16_strlen(ed->name);
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/pstore.h>
++#include <linux/ucs2_string.h>
+
+#define DUMP_NAME_LEN 52
+
+static bool efivars_pstore_disable =
+ IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
+
+module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
+
+#define PSTORE_EFI_ATTRIBUTES \
+ (EFI_VARIABLE_NON_VOLATILE | \
+ EFI_VARIABLE_BOOTSERVICE_ACCESS | \
+ EFI_VARIABLE_RUNTIME_ACCESS)
+
+static int efi_pstore_open(struct pstore_info *psi)
+{
+ efivar_entry_iter_begin();
+ psi->data = NULL;
+ return 0;
+}
+
+static int efi_pstore_close(struct pstore_info *psi)
+{
+ efivar_entry_iter_end();
+ psi->data = NULL;
+ return 0;
+}
+
+struct pstore_read_data {
+ u64 *id;
+ enum pstore_type_id *type;
+ int *count;
+ struct timespec *timespec;
+ char **buf;
+};
+
+static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
+{
+ efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
+ struct pstore_read_data *cb_data = data;
+ char name[DUMP_NAME_LEN];
+ int i;
+ int cnt;
+ unsigned int part;
+ unsigned long time, size;
+
+ if (efi_guidcmp(entry->var.VendorGuid, vendor))
+ return 0;
+
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ name[i] = entry->var.VariableName[i];
+
+ if (sscanf(name, "dump-type%u-%u-%d-%lu",
+ cb_data->type, &part, &cnt, &time) == 4) {
+ *cb_data->id = part;
+ *cb_data->count = cnt;
+ cb_data->timespec->tv_sec = time;
+ cb_data->timespec->tv_nsec = 0;
+ } else if (sscanf(name, "dump-type%u-%u-%lu",
+ cb_data->type, &part, &time) == 3) {
+ /*
+ * Check if an old format,
+ * which doesn't support holding
+ * multiple logs, remains.
+ */
+ *cb_data->id = part;
+ *cb_data->count = 0;
+ cb_data->timespec->tv_sec = time;
+ cb_data->timespec->tv_nsec = 0;
+ } else
+ return 0;
+
+ __efivar_entry_size(entry, &size);
+ *cb_data->buf = kmalloc(size, GFP_KERNEL);
+ if (*cb_data->buf == NULL)
+ return -ENOMEM;
+ memcpy(*cb_data->buf, entry->var.Data, size);
+ return size;
+}
+
+static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
+ int *count, struct timespec *timespec,
+ char **buf, struct pstore_info *psi)
+{
+ struct pstore_read_data data;
+
+ data.id = id;
+ data.type = type;
+ data.count = count;
+ data.timespec = timespec;
+ data.buf = buf;
+
+ return __efivar_entry_iter(efi_pstore_read_func, &efivar_sysfs_list, &data,
+ (struct efivar_entry **)&psi->data);
+}
+
+static int efi_pstore_write(enum pstore_type_id type,
+ enum kmsg_dump_reason reason, u64 *id,
+ unsigned int part, int count, size_t size,
+ struct pstore_info *psi)
+{
+ char name[DUMP_NAME_LEN];
+ efi_char16_t efi_name[DUMP_NAME_LEN];
+ efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
+ int i, ret = 0;
+
+ sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
+ get_seconds());
+
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name[i] = name[i];
+
+ efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
+ !pstore_cannot_block_path(reason),
+ size, psi->buf);
+
+ if (reason == KMSG_DUMP_OOPS)
+ efivar_run_worker();
+
+ *id = part;
+ return ret;
+};
+
+struct pstore_erase_data {
+ u64 id;
+ enum pstore_type_id type;
+ int count;
+ struct timespec time;
+ efi_char16_t *name;
+};
+
+/*
+ * Clean up an entry with the same name
+ */
+static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
+{
+ struct pstore_erase_data *ed = data;
+ efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
+ efi_char16_t efi_name_old[DUMP_NAME_LEN];
+ efi_char16_t *efi_name = ed->name;
- if (utf16_strncmp(entry->var.VariableName,
- efi_name, (size_t)utf16_len)) {
++ unsigned long ucs2_len = ucs2_strlen(ed->name);
+ char name_old[DUMP_NAME_LEN];
+ int i;
+
+ if (efi_guidcmp(entry->var.VendorGuid, vendor))
+ return 0;
+
- if (utf16_strncmp(entry->var.VariableName, efi_name_old,
- utf16_strlen(efi_name_old)))
++ if (ucs2_strncmp(entry->var.VariableName,
++ efi_name, (size_t)ucs2_len)) {
+ /*
+ * Check if an old format, which doesn't support
+ * holding multiple logs, remains.
+ */
+ sprintf(name_old, "dump-type%u-%u-%lu", ed->type,
+ (unsigned int)ed->id, ed->time.tv_sec);
+
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name_old[i] = name_old[i];
+
++ if (ucs2_strncmp(entry->var.VariableName, efi_name_old,
++ ucs2_strlen(efi_name_old)))
+ return 0;
+ }
+
+ /* found */
+ __efivar_entry_delete(entry);
+ return 1;
+}
+
+static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
+ struct timespec time, struct pstore_info *psi)
+{
+ struct pstore_erase_data edata;
+ struct efivar_entry *entry;
+ char name[DUMP_NAME_LEN];
+ efi_char16_t efi_name[DUMP_NAME_LEN];
+ int found, i;
+
+ sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
+ time.tv_sec);
+
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name[i] = name[i];
+
+ edata.id = id;
+ edata.type = type;
+ edata.count = count;
+ edata.time = time;
+ edata.name = efi_name;
+
+ efivar_entry_iter_begin();
+ found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list, &edata, &entry);
+ efivar_entry_iter_end();
+
+ if (found)
+ efivar_unregister(entry);
+
+ return 0;
+}
+
+static struct pstore_info efi_pstore_info = {
+ .owner = THIS_MODULE,
+ .name = "efi",
+ .open = efi_pstore_open,
+ .close = efi_pstore_close,
+ .read = efi_pstore_read,
+ .write = efi_pstore_write,
+ .erase = efi_pstore_erase,
+};
+
+static __init int efivars_pstore_init(void)
+{
+ if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ return 0;
+
+ if (!efivars_kobject())
+ return 0;
+
+ if (efivars_pstore_disable)
+ return 0;
+
+ efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
+ if (!efi_pstore_info.buf)
+ return -ENOMEM;
+
+ efi_pstore_info.bufsize = 1024;
+ spin_lock_init(&efi_pstore_info.buf_lock);
+
+ pstore_register(&efi_pstore_info);
+
+ return 0;
+}
+
+static __exit void efivars_pstore_exit(void)
+{
+}
+
+module_init(efivars_pstore_init);
+module_exit(efivars_pstore_exit);
+
+MODULE_DESCRIPTION("EFI variable backend for pstore");
+MODULE_LICENSE("GPL");
--- /dev/null
- generic_ops.query_variable_info = efi.query_variable_info;
+/*
+ * efi.c - EFI subsystem
+ *
+ * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
+ * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
+ * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+ *
+ * This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
+ * allowing the efivarfs to be mounted or the efivars module to be loaded.
+ * The existance of /sys/firmware/efi may also be used by userspace to
+ * determine that the system supports EFI.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/efi.h>
+
+static struct kobject *efi_kobj;
+static struct kobject *efivars_kobj;
+
+/*
+ * Let's not leave out systab information that snuck into
+ * the efivars driver
+ */
+static ssize_t systab_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ char *str = buf;
+
+ if (!kobj || !buf)
+ return -EINVAL;
+
+ if (efi.mps != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "MPS=0x%lx\n", efi.mps);
+ if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
+ if (efi.acpi != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
+ if (efi.smbios != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
+ if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
+ if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
+ if (efi.uga != EFI_INVALID_TABLE_ADDR)
+ str += sprintf(str, "UGA=0x%lx\n", efi.uga);
+
+ return str - buf;
+}
+
+static struct kobj_attribute efi_attr_systab =
+ __ATTR(systab, 0400, systab_show, NULL);
+
+static struct attribute *efi_subsys_attrs[] = {
+ &efi_attr_systab.attr,
+ NULL, /* maybe more in the future? */
+};
+
+static struct attribute_group efi_subsys_attr_group = {
+ .attrs = efi_subsys_attrs,
+};
+
+static struct efivars generic_efivars;
+static struct efivar_operations generic_ops;
+
+static int generic_ops_register(void)
+{
+ generic_ops.get_variable = efi.get_variable;
+ generic_ops.set_variable = efi.set_variable;
+ generic_ops.get_next_variable = efi.get_next_variable;
++ generic_ops.query_variable_store = efi_query_variable_store;
+
+ return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
+}
+
+static void generic_ops_unregister(void)
+{
+ efivars_unregister(&generic_efivars);
+}
+
+/*
+ * We register the efi subsystem with the firmware subsystem and the
+ * efivars subsystem with the efi subsystem, if the system was booted with
+ * EFI.
+ */
+static int __init efisubsys_init(void)
+{
+ int error;
+
+ if (!efi_enabled(EFI_BOOT))
+ return 0;
+
+ /* We register the efi directory at /sys/firmware/efi */
+ efi_kobj = kobject_create_and_add("efi", firmware_kobj);
+ if (!efi_kobj) {
+ pr_err("efi: Firmware registration failed.\n");
+ return -ENOMEM;
+ }
+
+ error = generic_ops_register();
+ if (error)
+ goto err_put;
+
+ error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
+ if (error) {
+ pr_err("efi: Sysfs attribute export failed with error %d.\n",
+ error);
+ goto err_unregister;
+ }
+
+ /* and the standard mountpoint for efivarfs */
+ efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
+ if (!efivars_kobj) {
+ pr_err("efivars: Subsystem registration failed.\n");
+ error = -ENOMEM;
+ goto err_remove_group;
+ }
+
+ return 0;
+
+err_remove_group:
+ sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
+err_unregister:
+ generic_ops_unregister();
+err_put:
+ kobject_put(efi_kobj);
+ return error;
+}
+
+subsys_initcall(efisubsys_init);
--- /dev/null
- variable_name_size = utf16_strlen(variable_name) * sizeof(efi_char16_t);
+/*
+ * Originally from efivars.c,
+ *
+ * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
+ * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
+ *
+ * This code takes all variables accessible from EFI runtime and
+ * exports them via sysfs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Changelog:
+ *
+ * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com>
+ * remove check for efi_enabled in exit
+ * add MODULE_VERSION
+ *
+ * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com>
+ * minor bug fixes
+ *
+ * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com)
+ * converted driver to export variable information via sysfs
+ * and moved to drivers/firmware directory
+ * bumped revision number to v0.07 to reflect conversion & move
+ *
+ * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com>
+ * 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()
+ *
+ * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
+ * use list_for_each_safe when deleting vars.
+ * remove ifdef CONFIG_SMP around include <linux/smp.h>
+ * v0.04 release to linux-ia64@linuxia64.org
+ *
+ * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
+ * Moved vars from /proc/efi to /proc/efi/vars, and made
+ * efi.c own the /proc/efi directory.
+ * v0.03 release to linux-ia64@linuxia64.org
+ *
+ * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
+ * At the request of Stephane, moved ownership of /proc/efi
+ * to efi.c, and now efivars lives under /proc/efi/vars.
+ *
+ * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
+ * Feedback received from Stephane Eranian incorporated.
+ * efivar_write() checks copy_from_user() return value.
+ * efivar_read/write() returns proper errno.
+ * v0.02 release to linux-ia64@linuxia64.org
+ *
+ * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
+ * v0.01 release to linux-ia64@linuxia64.org
+ */
+
+#include <linux/efi.h>
+#include <linux/module.h>
++#include <linux/ucs2_string.h>
+
+#define EFIVARS_VERSION "0.08"
+#define EFIVARS_DATE "2004-May-17"
+
+MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
+MODULE_DESCRIPTION("sysfs interface to EFI Variables");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(EFIVARS_VERSION);
+
+LIST_HEAD(efivar_sysfs_list);
+EXPORT_SYMBOL_GPL(efivar_sysfs_list);
+
+static struct kset *efivars_kset;
+
+static struct bin_attribute *efivars_new_var;
+static struct bin_attribute *efivars_del_var;
+
+struct efivar_attribute {
+ struct attribute attr;
+ ssize_t (*show) (struct efivar_entry *entry, char *buf);
+ ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
+};
+
+#define EFIVAR_ATTR(_name, _mode, _show, _store) \
+struct efivar_attribute efivar_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode}, \
+ .show = _show, \
+ .store = _store, \
+};
+
+#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
+#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj)
+
+/*
+ * Prototype for sysfs creation function
+ */
+static int
+efivar_create_sysfs_entry(struct efivar_entry *new_var);
+
+static ssize_t
+efivar_guid_read(struct efivar_entry *entry, char *buf)
+{
+ struct efi_variable *var = &entry->var;
+ char *str = buf;
+
+ if (!entry || !buf)
+ return 0;
+
+ efi_guid_unparse(&var->VendorGuid, str);
+ str += strlen(str);
+ str += sprintf(str, "\n");
+
+ return str - buf;
+}
+
+static ssize_t
+efivar_attr_read(struct efivar_entry *entry, char *buf)
+{
+ struct efi_variable *var = &entry->var;
+ char *str = buf;
+
+ if (!entry || !buf)
+ return -EINVAL;
+
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ return -EIO;
+
+ if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
+ str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n");
+ if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)
+ str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n");
+ if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)
+ str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n");
+ if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD)
+ str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n");
+ if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
+ str += sprintf(str,
+ "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n");
+ if (var->Attributes &
+ EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
+ str += sprintf(str,
+ "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n");
+ if (var->Attributes & EFI_VARIABLE_APPEND_WRITE)
+ str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n");
+ return str - buf;
+}
+
+static ssize_t
+efivar_size_read(struct efivar_entry *entry, char *buf)
+{
+ struct efi_variable *var = &entry->var;
+ char *str = buf;
+
+ if (!entry || !buf)
+ return -EINVAL;
+
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ return -EIO;
+
+ str += sprintf(str, "0x%lx\n", var->DataSize);
+ return str - buf;
+}
+
+static ssize_t
+efivar_data_read(struct efivar_entry *entry, char *buf)
+{
+ struct efi_variable *var = &entry->var;
+
+ if (!entry || !buf)
+ return -EINVAL;
+
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ return -EIO;
+
+ memcpy(buf, var->Data, var->DataSize);
+ return var->DataSize;
+}
+/*
+ * We allow each variable to be edited via rewriting the
+ * entire efi variable structure.
+ */
+static ssize_t
+efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
+{
+ struct efi_variable *new_var, *var = &entry->var;
+ int err;
+
+ if (count != sizeof(struct efi_variable))
+ return -EINVAL;
+
+ new_var = (struct efi_variable *)buf;
+ /*
+ * If only updating the variable data, then the name
+ * and guid should remain the same
+ */
+ if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) ||
+ efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) {
+ printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
+ return -EINVAL;
+ }
+
+ if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){
+ printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
+ return -EINVAL;
+ }
+
+ if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
+ efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
+ printk(KERN_ERR "efivars: Malformed variable content\n");
+ return -EINVAL;
+ }
+
+ memcpy(&entry->var, new_var, count);
+
+ err = efivar_entry_set(entry, new_var->Attributes,
+ new_var->DataSize, new_var->Data, false);
+ if (err) {
+ printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
+ return -EIO;
+ }
+
+ return count;
+}
+
+static ssize_t
+efivar_show_raw(struct efivar_entry *entry, char *buf)
+{
+ struct efi_variable *var = &entry->var;
+
+ if (!entry || !buf)
+ return 0;
+
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &entry->var.Attributes,
+ &entry->var.DataSize, entry->var.Data))
+ return -EIO;
+
+ memcpy(buf, var, sizeof(*var));
+
+ return sizeof(*var);
+}
+
+/*
+ * Generic read/write functions that call the specific functions of
+ * the attributes...
+ */
+static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct efivar_entry *var = to_efivar_entry(kobj);
+ struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
+ ssize_t ret = -EIO;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (efivar_attr->show) {
+ ret = efivar_attr->show(var, buf);
+ }
+ return ret;
+}
+
+static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
+{
+ struct efivar_entry *var = to_efivar_entry(kobj);
+ struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
+ ssize_t ret = -EIO;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (efivar_attr->store)
+ ret = efivar_attr->store(var, buf, count);
+
+ return ret;
+}
+
+static const struct sysfs_ops efivar_attr_ops = {
+ .show = efivar_attr_show,
+ .store = efivar_attr_store,
+};
+
+static void efivar_release(struct kobject *kobj)
+{
+ struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj);
+ kfree(var);
+}
+
+static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
+static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
+static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
+static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
+static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
+
+static struct attribute *def_attrs[] = {
+ &efivar_attr_guid.attr,
+ &efivar_attr_size.attr,
+ &efivar_attr_attributes.attr,
+ &efivar_attr_data.attr,
+ &efivar_attr_raw_var.attr,
+ NULL,
+};
+
+static struct kobj_type efivar_ktype = {
+ .release = efivar_release,
+ .sysfs_ops = &efivar_attr_ops,
+ .default_attrs = def_attrs,
+};
+
+static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t count)
+{
+ struct efi_variable *new_var = (struct efi_variable *)buf;
+ struct efivar_entry *new_entry;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
+ efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
+ printk(KERN_ERR "efivars: Malformed variable content\n");
+ return -EINVAL;
+ }
+
+ new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
+ if (!new_entry)
+ return -ENOMEM;
+
+ memcpy(&new_entry->var, new_var, sizeof(*new_var));
+
+ err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize,
+ new_var->Data, &efivar_sysfs_list);
+ if (err) {
+ if (err == -EEXIST)
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (efivar_create_sysfs_entry(new_entry)) {
+ printk(KERN_WARNING "efivars: failed to create sysfs entry.\n");
+ kfree(new_entry);
+ }
+ return count;
+
+out:
+ kfree(new_entry);
+ return err;
+}
+
+static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t count)
+{
+ struct efi_variable *del_var = (struct efi_variable *)buf;
+ struct efivar_entry *entry;
+ int err = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ efivar_entry_iter_begin();
+ entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid,
+ &efivar_sysfs_list, true);
+ if (!entry)
+ err = -EINVAL;
+ else if (__efivar_entry_delete(entry))
+ err = -EIO;
+
+ efivar_entry_iter_end();
+
+ if (err)
+ return err;
+
+ efivar_unregister(entry);
+
+ /* It's dead Jim.... */
+ return count;
+}
+
+/**
+ * efivar_create_sysfs_entry - create a new entry in sysfs
+ * @new_var: efivar entry to create
+ *
+ * Returns 1 on failure, 0 on success
+ */
+static int
+efivar_create_sysfs_entry(struct efivar_entry *new_var)
+{
+ int i, short_name_size;
+ char *short_name;
+ unsigned long variable_name_size;
+ efi_char16_t *variable_name;
+
+ variable_name = new_var->var.VariableName;
++ variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t);
+
+ /*
+ * Length of the variable bytes in ASCII, plus the '-' separator,
+ * plus the GUID, plus trailing NUL
+ */
+ short_name_size = variable_name_size / sizeof(efi_char16_t)
+ + 1 + EFI_VARIABLE_GUID_LEN + 1;
+
+ short_name = kzalloc(short_name_size, GFP_KERNEL);
+
+ if (!short_name) {
+ kfree(short_name);
+ return 1;
+ }
+
+ /* Convert Unicode to normal chars (assume top bits are 0),
+ ala UTF-8 */
+ for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) {
+ short_name[i] = variable_name[i] & 0xFF;
+ }
+ /* This is ugly, but necessary to separate one vendor's
+ private variables from another's. */
+
+ *(short_name + strlen(short_name)) = '-';
+ efi_guid_unparse(&new_var->var.VendorGuid,
+ short_name + strlen(short_name));
+
+ new_var->kobj.kset = efivars_kset;
+
+ i = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
+ NULL, "%s", short_name);
+ kfree(short_name);
+ if (i)
+ return 1;
+
+ kobject_uevent(&new_var->kobj, KOBJ_ADD);
+ efivar_entry_add(new_var, &efivar_sysfs_list);
+
+ return 0;
+}
+
+static int
+create_efivars_bin_attributes(void)
+{
+ struct bin_attribute *attr;
+ int error;
+
+ /* new_var */
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->attr.name = "new_var";
+ attr->attr.mode = 0200;
+ attr->write = efivar_create;
+ efivars_new_var = attr;
+
+ /* del_var */
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr) {
+ error = -ENOMEM;
+ goto out_free;
+ }
+ attr->attr.name = "del_var";
+ attr->attr.mode = 0200;
+ attr->write = efivar_delete;
+ efivars_del_var = attr;
+
+ sysfs_bin_attr_init(efivars_new_var);
+ sysfs_bin_attr_init(efivars_del_var);
+
+ /* Register */
+ error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var);
+ if (error) {
+ printk(KERN_ERR "efivars: unable to create new_var sysfs file"
+ " due to error %d\n", error);
+ goto out_free;
+ }
+
+ error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var);
+ if (error) {
+ printk(KERN_ERR "efivars: unable to create del_var sysfs file"
+ " due to error %d\n", error);
+ sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
+ goto out_free;
+ }
+
+ return 0;
+out_free:
+ kfree(efivars_del_var);
+ efivars_del_var = NULL;
+ kfree(efivars_new_var);
+ efivars_new_var = NULL;
+ return error;
+}
+
+static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor,
+ unsigned long name_size, void *data)
+{
+ struct efivar_entry *entry = data;
+
+ if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false))
+ return 0;
+
+ memcpy(entry->var.VariableName, name, name_size);
+ memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
+
+ return 1;
+}
+
+static void efivar_update_sysfs_entries(struct work_struct *work)
+{
+ struct efivar_entry *entry;
+ int err;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return;
+
+ /* Add new sysfs entries */
+ while (1) {
+ memset(entry, 0, sizeof(*entry));
+
+ err = efivar_init(efivar_update_sysfs_entry, entry,
+ true, false, &efivar_sysfs_list);
+ if (!err)
+ break;
+
+ efivar_create_sysfs_entry(entry);
+ }
+
+ kfree(entry);
+}
+
+static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
+ unsigned long name_size, void *data)
+{
+ struct efivar_entry *entry;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ memcpy(entry->var.VariableName, name, name_size);
+ memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
+
+ efivar_create_sysfs_entry(entry);
+
+ return 0;
+}
+
+static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
+{
+ efivar_entry_remove(entry);
+ efivar_unregister(entry);
+ return 0;
+}
+
+void efivars_sysfs_exit(void)
+{
+ /* Remove all entries and destroy */
+ __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL);
+
+ if (efivars_new_var)
+ sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
+ if (efivars_del_var)
+ sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var);
+ kfree(efivars_new_var);
+ kfree(efivars_del_var);
+ kset_unregister(efivars_kset);
+}
+
+int efivars_sysfs_init(void)
+{
+ struct kobject *parent_kobj = efivars_kobject();
+ int error = 0;
+
+ /* No efivars has been registered yet */
+ if (!parent_kobj)
+ return 0;
+
+ printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
+ EFIVARS_DATE);
+
+ efivars_kset = kset_create_and_add("vars", NULL, parent_kobj);
+ if (!efivars_kset) {
+ printk(KERN_ERR "efivars: Subsystem registration failed.\n");
+ return -ENOMEM;
+ }
+
+ efivar_init(efivars_sysfs_callback, NULL, false,
+ true, &efivar_sysfs_list);
+
+ error = create_efivars_bin_attributes();
+ if (error) {
+ efivars_sysfs_exit();
+ return error;
+ }
+
+ INIT_WORK(&efivar_work, efivar_update_sysfs_entries);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(efivars_sysfs_init);
+
+module_init(efivars_sysfs_init);
+module_exit(efivars_sysfs_exit);
--- /dev/null
- namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName));
+/*
+ * Originally from efivars.c
+ *
+ * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
+ * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/capability.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/smp.h>
+#include <linux/efi.h>
+#include <linux/sysfs.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/ctype.h>
++#include <linux/ucs2_string.h>
+
+/* Private pointer to registered efivars */
+static struct efivars *__efivars;
+
+static bool efivar_wq_enabled = true;
+DECLARE_WORK(efivar_work, NULL);
+EXPORT_SYMBOL_GPL(efivar_work);
+
+static bool
+validate_device_path(struct efi_variable *var, int match, u8 *buffer,
+ unsigned long len)
+{
+ struct efi_generic_dev_path *node;
+ int offset = 0;
+
+ node = (struct efi_generic_dev_path *)buffer;
+
+ if (len < sizeof(*node))
+ return false;
+
+ while (offset <= len - sizeof(*node) &&
+ node->length >= sizeof(*node) &&
+ node->length <= len - offset) {
+ offset += node->length;
+
+ if ((node->type == EFI_DEV_END_PATH ||
+ node->type == EFI_DEV_END_PATH2) &&
+ node->sub_type == EFI_DEV_END_ENTIRE)
+ return true;
+
+ node = (struct efi_generic_dev_path *)(buffer + offset);
+ }
+
+ /*
+ * If we're here then either node->length pointed past the end
+ * of the buffer or we reached the end of the buffer without
+ * finding a device path end node.
+ */
+ return false;
+}
+
+static bool
+validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
+ unsigned long len)
+{
+ /* An array of 16-bit integers */
+ if ((len % 2) != 0)
+ return false;
+
+ return true;
+}
+
+static bool
+validate_load_option(struct efi_variable *var, int match, u8 *buffer,
+ unsigned long len)
+{
+ u16 filepathlength;
+ int i, desclength = 0, namelen;
+
- desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
++ namelen = ucs2_strnlen(var->VariableName, sizeof(var->VariableName));
+
+ /* Either "Boot" or "Driver" followed by four digits of hex */
+ for (i = match; i < match+4; i++) {
+ if (var->VariableName[i] > 127 ||
+ hex_to_bin(var->VariableName[i] & 0xff) < 0)
+ return true;
+ }
+
+ /* Reject it if there's 4 digits of hex and then further content */
+ if (namelen > match + 4)
+ return false;
+
+ /* A valid entry must be at least 8 bytes */
+ if (len < 8)
+ return false;
+
+ filepathlength = buffer[4] | buffer[5] << 8;
+
+ /*
+ * There's no stored length for the description, so it has to be
+ * found by hand
+ */
- u64 storage_size, remaining_size, max_size;
- efi_status_t status;
++ desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
+
+ /* Each boot entry must have a descriptor */
+ if (!desclength)
+ return false;
+
+ /*
+ * If the sum of the length of the description, the claimed filepath
+ * length and the original header are greater than the length of the
+ * variable, it's malformed
+ */
+ if ((desclength + filepathlength + 6) > len)
+ return false;
+
+ /*
+ * And, finally, check the filepath
+ */
+ return validate_device_path(var, match, buffer + desclength + 6,
+ filepathlength);
+}
+
+static bool
+validate_uint16(struct efi_variable *var, int match, u8 *buffer,
+ unsigned long len)
+{
+ /* A single 16-bit integer */
+ if (len != 2)
+ return false;
+
+ return true;
+}
+
+static bool
+validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,
+ unsigned long len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (buffer[i] > 127)
+ return false;
+
+ if (buffer[i] == 0)
+ return true;
+ }
+
+ return false;
+}
+
+struct variable_validate {
+ char *name;
+ bool (*validate)(struct efi_variable *var, int match, u8 *data,
+ unsigned long len);
+};
+
+static const struct variable_validate variable_validate[] = {
+ { "BootNext", validate_uint16 },
+ { "BootOrder", validate_boot_order },
+ { "DriverOrder", validate_boot_order },
+ { "Boot*", validate_load_option },
+ { "Driver*", validate_load_option },
+ { "ConIn", validate_device_path },
+ { "ConInDev", validate_device_path },
+ { "ConOut", validate_device_path },
+ { "ConOutDev", validate_device_path },
+ { "ErrOut", validate_device_path },
+ { "ErrOutDev", validate_device_path },
+ { "Timeout", validate_uint16 },
+ { "Lang", validate_ascii_string },
+ { "PlatformLang", validate_ascii_string },
+ { "", NULL },
+};
+
+bool
+efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
+{
+ int i;
+ u16 *unicode_name = var->VariableName;
+
+ for (i = 0; variable_validate[i].validate != NULL; i++) {
+ const char *name = variable_validate[i].name;
+ int match;
+
+ for (match = 0; ; match++) {
+ char c = name[match];
+ u16 u = unicode_name[match];
+
+ /* All special variables are plain ascii */
+ if (u > 127)
+ return true;
+
+ /* Wildcard in the matching name means we've matched */
+ if (c == '*')
+ return variable_validate[i].validate(var,
+ match, data, len);
+
+ /* Case sensitive match */
+ if (c != u)
+ break;
+
+ /* Reached the end of the string while matching */
+ if (!c)
+ return variable_validate[i].validate(var,
+ match, data, len);
+ }
+ }
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(efivar_validate);
+
+static efi_status_t
+check_var_size(u32 attributes, unsigned long size)
+{
- if (!fops->query_variable_info)
+ const struct efivar_operations *fops = __efivars->ops;
+
- status = fops->query_variable_info(attributes, &storage_size,
- &remaining_size, &max_size);
-
- if (status != EFI_SUCCESS)
- return status;
-
- if (!storage_size || size > remaining_size || size > max_size ||
- (remaining_size - size) < (storage_size / 2))
- return EFI_OUT_OF_RESOURCES;
-
- return status;
++ if (!fops->query_variable_store)
+ return EFI_UNSUPPORTED;
+
- strsize1 = utf16_strsize(variable_name, 1024);
++ return fops->query_variable_store(attributes, size);
+}
+
+static int efi_status_to_err(efi_status_t status)
+{
+ int err;
+
+ switch (status) {
+ case EFI_SUCCESS:
+ err = 0;
+ break;
+ case EFI_INVALID_PARAMETER:
+ err = -EINVAL;
+ break;
+ case EFI_OUT_OF_RESOURCES:
+ err = -ENOSPC;
+ break;
+ case EFI_DEVICE_ERROR:
+ err = -EIO;
+ break;
+ case EFI_WRITE_PROTECTED:
+ err = -EROFS;
+ break;
+ case EFI_SECURITY_VIOLATION:
+ err = -EACCES;
+ break;
+ case EFI_NOT_FOUND:
+ err = -ENOENT;
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor,
+ struct list_head *head)
+{
+ struct efivar_entry *entry, *n;
+ unsigned long strsize1, strsize2;
+ bool found = false;
+
- strsize2 = utf16_strsize(entry->var.VariableName, 1024);
++ strsize1 = ucs2_strsize(variable_name, 1024);
+ list_for_each_entry_safe(entry, n, head, list) {
- status = check_var_size(attributes, size + utf16_strsize(name, 1024));
++ strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
+ if (strsize1 == strsize2 &&
+ !memcmp(variable_name, &(entry->var.VariableName),
+ strsize2) &&
+ !efi_guidcmp(entry->var.VendorGuid,
+ *vendor)) {
+ found = true;
+ break;
+ }
+ }
+ return found;
+}
+
+/*
+ * Returns the size of variable_name, in bytes, including the
+ * terminating NULL character, or variable_name_size if no NULL
+ * character is found among the first variable_name_size bytes.
+ */
+static unsigned long var_name_strnsize(efi_char16_t *variable_name,
+ unsigned long variable_name_size)
+{
+ unsigned long len;
+ efi_char16_t c;
+
+ /*
+ * The variable name is, by definition, a NULL-terminated
+ * string, so make absolutely sure that variable_name_size is
+ * the value we expect it to be. If not, return the real size.
+ */
+ for (len = 2; len <= variable_name_size; len += sizeof(c)) {
+ c = variable_name[(len / sizeof(c)) - 1];
+ if (!c)
+ break;
+ }
+
+ return min(len, variable_name_size);
+}
+
+/*
+ * Print a warning when duplicate EFI variables are encountered and
+ * disable the sysfs workqueue since the firmware is buggy.
+ */
+static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid,
+ unsigned long len16)
+{
+ size_t i, len8 = len16 / sizeof(efi_char16_t);
+ char *s8;
+
+ /*
+ * Disable the workqueue since the algorithm it uses for
+ * detecting new variables won't work with this buggy
+ * implementation of GetNextVariableName().
+ */
+ efivar_wq_enabled = false;
+
+ s8 = kzalloc(len8, GFP_KERNEL);
+ if (!s8)
+ return;
+
+ for (i = 0; i < len8; i++)
+ s8[i] = s16[i];
+
+ printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n",
+ s8, vendor_guid);
+ kfree(s8);
+}
+
+/**
+ * efivar_init - build the initial list of EFI variables
+ * @func: callback function to invoke for every variable
+ * @data: function-specific data to pass to @func
+ * @atomic: do we need to execute the @func-loop atomically?
+ * @duplicates: error if we encounter duplicates on @head?
+ * @head: initialised head of variable list
+ *
+ * Get every EFI variable from the firmware and invoke @func. @func
+ * should call efivar_entry_add() to build the list of variables.
+ *
+ * Returns 0 on success, or a kernel error code on failure.
+ */
+int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
+ void *data, bool atomic, bool duplicates,
+ struct list_head *head)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ unsigned long variable_name_size = 1024;
+ efi_char16_t *variable_name;
+ efi_status_t status;
+ efi_guid_t vendor_guid;
+ int err = 0;
+
+ variable_name = kzalloc(variable_name_size, GFP_KERNEL);
+ if (!variable_name) {
+ printk(KERN_ERR "efivars: Memory allocation failed.\n");
+ return -ENOMEM;
+ }
+
+ spin_lock_irq(&__efivars->lock);
+
+ /*
+ * Per EFI spec, the maximum storage allocated for both
+ * the variable name and variable data is 1024 bytes.
+ */
+
+ do {
+ variable_name_size = 1024;
+
+ status = ops->get_next_variable(&variable_name_size,
+ variable_name,
+ &vendor_guid);
+ switch (status) {
+ case EFI_SUCCESS:
+ if (!atomic)
+ spin_unlock_irq(&__efivars->lock);
+
+ variable_name_size = var_name_strnsize(variable_name,
+ variable_name_size);
+
+ /*
+ * Some firmware implementations return the
+ * same variable name on multiple calls to
+ * get_next_variable(). Terminate the loop
+ * immediately as there is no guarantee that
+ * we'll ever see a different variable name,
+ * and may end up looping here forever.
+ */
+ if (duplicates &&
+ variable_is_present(variable_name, &vendor_guid, head)) {
+ dup_variable_bug(variable_name, &vendor_guid,
+ variable_name_size);
+ if (!atomic)
+ spin_lock_irq(&__efivars->lock);
+
+ status = EFI_NOT_FOUND;
+ break;
+ }
+
+ err = func(variable_name, vendor_guid, variable_name_size, data);
+ if (err)
+ status = EFI_NOT_FOUND;
+
+ if (!atomic)
+ spin_lock_irq(&__efivars->lock);
+
+ break;
+ case EFI_NOT_FOUND:
+ break;
+ default:
+ printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n",
+ status);
+ status = EFI_NOT_FOUND;
+ break;
+ }
+
+ } while (status != EFI_NOT_FOUND);
+
+ spin_unlock_irq(&__efivars->lock);
+
+ kfree(variable_name);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(efivar_init);
+
+/**
+ * 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)
+{
+ spin_lock_irq(&__efivars->lock);
+ list_add(&entry->list, head);
+ spin_unlock_irq(&__efivars->lock);
+}
+EXPORT_SYMBOL_GPL(efivar_entry_add);
+
+/**
+ * efivar_entry_remove - remove entry from variable list
+ * @entry: entry to remove from list
+ */
+void efivar_entry_remove(struct efivar_entry *entry)
+{
+ spin_lock_irq(&__efivars->lock);
+ list_del(&entry->list);
+ spin_unlock_irq(&__efivars->lock);
+}
+EXPORT_SYMBOL_GPL(efivar_entry_remove);
+
+/*
+ * efivar_entry_list_del_unlock - remove entry from variable list
+ * @entry: entry to remove
+ *
+ * Remove @entry from the variable list and release the list lock.
+ *
+ * NOTE: slightly weird locking semantics here - we expect to be
+ * called with the efivars lock already held, and we release it before
+ * returning. This is because this function is usually called after
+ * set_variable() while the lock is still held.
+ */
+static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
+{
+ WARN_ON(!spin_is_locked(&__efivars->lock));
+
+ list_del(&entry->list);
+ spin_unlock_irq(&__efivars->lock);
+}
+
+/**
+ * __efivar_entry_delete - delete an EFI variable
+ * @entry: entry containing EFI variable to delete
+ *
+ * Delete the variable from the firmware but leave @entry on the
+ * variable list.
+ *
+ * This function differs from efivar_entry_delete() because it does
+ * not remove @entry from the variable list. Also, it is safe to be
+ * called from within a efivar_entry_iter_begin() and
+ * efivar_entry_iter_end() region, unlike efivar_entry_delete().
+ *
+ * Returns 0 on success, or a converted EFI status code if
+ * set_variable() fails.
+ */
+int __efivar_entry_delete(struct efivar_entry *entry)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+
+ WARN_ON(!spin_is_locked(&__efivars->lock));
+
+ status = ops->set_variable(entry->var.VariableName,
+ &entry->var.VendorGuid,
+ 0, 0, NULL);
+
+ return efi_status_to_err(status);
+}
+EXPORT_SYMBOL_GPL(__efivar_entry_delete);
+
+/**
+ * efivar_entry_delete - delete variable and remove entry from list
+ * @entry: entry containing variable to delete
+ *
+ * Delete the variable from the firmware and remove @entry from the
+ * variable list. It is the caller's responsibility to free @entry
+ * once we return.
+ *
+ * Returns 0 on success, or a converted EFI status code if
+ * set_variable() fails.
+ */
+int efivar_entry_delete(struct efivar_entry *entry)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+
+ spin_lock_irq(&__efivars->lock);
+ status = ops->set_variable(entry->var.VariableName,
+ &entry->var.VendorGuid,
+ 0, 0, NULL);
+ if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) {
+ spin_unlock_irq(&__efivars->lock);
+ return efi_status_to_err(status);
+ }
+
+ efivar_entry_list_del_unlock(entry);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(efivar_entry_delete);
+
+/**
+ * efivar_entry_set - call set_variable()
+ * @entry: entry containing the EFI variable to write
+ * @attributes: variable attributes
+ * @size: size of @data buffer
+ * @data: buffer containing variable data
+ * @head: head of variable list
+ *
+ * Calls set_variable() for an EFI variable. If creating a new EFI
+ * variable, this function is usually followed by efivar_entry_add().
+ *
+ * Before writing the variable, the remaining EFI variable storage
+ * space is checked to ensure there is enough room available.
+ *
+ * If @head is not NULL a lookup is performed to determine whether
+ * the entry is already on the list.
+ *
+ * Returns 0 on success, -EEXIST if a lookup is performed and the entry
+ * already exists on the list, or a converted EFI status code if
+ * set_variable() fails.
+ */
+int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
+ unsigned long size, void *data, struct list_head *head)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+ efi_char16_t *name = entry->var.VariableName;
+ efi_guid_t vendor = entry->var.VendorGuid;
+
+ spin_lock_irq(&__efivars->lock);
+
+ if (head && efivar_entry_find(name, vendor, head, false)) {
+ spin_unlock_irq(&__efivars->lock);
+ return -EEXIST;
+ }
+
- if (!ops->query_variable_info)
++ status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
+ if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED)
+ status = ops->set_variable(name, &vendor,
+ attributes, size, data);
+
+ spin_unlock_irq(&__efivars->lock);
+
+ return efi_status_to_err(status);
+
+}
+EXPORT_SYMBOL_GPL(efivar_entry_set);
+
+/**
+ * efivar_entry_set_safe - call set_variable() if enough space in firmware
+ * @name: buffer containing the variable name
+ * @vendor: variable vendor guid
+ * @attributes: variable attributes
+ * @block: can we block in this context?
+ * @size: size of @data buffer
+ * @data: buffer containing variable data
+ *
+ * Ensures there is enough free storage in the firmware for this variable, and
+ * if so, calls set_variable(). If creating a new EFI variable, this function
+ * is usually followed by efivar_entry_add().
+ *
+ * Returns 0 on success, -ENOSPC if the firmware does not have enough
+ * space for set_variable() to succeed, or a converted EFI status code
+ * if set_variable() fails.
+ */
+int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
+ bool block, unsigned long size, void *data)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ unsigned long flags;
+ efi_status_t status;
+
- status = check_var_size(attributes, size + utf16_strsize(name, 1024));
++ if (!ops->query_variable_store)
+ return -ENOSYS;
+
+ if (!block && spin_trylock_irqsave(&__efivars->lock, flags))
+ return -EBUSY;
+ else
+ spin_lock_irqsave(&__efivars->lock, flags);
+
- strsize1 = utf16_strsize(name, 1024);
- strsize2 = utf16_strsize(entry->var.VariableName, 1024);
++ status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
+ if (status != EFI_SUCCESS) {
+ spin_unlock_irqrestore(&__efivars->lock, flags);
+ return -ENOSPC;
+ }
+
+ status = ops->set_variable(name, &vendor, attributes, size, data);
+
+ spin_unlock_irqrestore(&__efivars->lock, flags);
+
+ return efi_status_to_err(status);
+}
+EXPORT_SYMBOL_GPL(efivar_entry_set_safe);
+
+/**
+ * efivar_entry_find - search for an entry
+ * @name: the EFI variable name
+ * @guid: the EFI variable vendor's guid
+ * @head: head of the variable list
+ * @remove: should we remove the entry from the list?
+ *
+ * Search for an entry on the variable list that has the EFI variable
+ * name @name and vendor guid @guid. If an entry is found on the list
+ * and @remove is true, the entry is removed from the list.
+ *
+ * The caller MUST call efivar_entry_iter_begin() and
+ * efivar_entry_iter_end() before and after the invocation of this
+ * function, respectively.
+ *
+ * Returns the entry if found on the list, %NULL otherwise.
+ */
+struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
+ struct list_head *head, bool remove)
+{
+ struct efivar_entry *entry, *n;
+ int strsize1, strsize2;
+ bool found = false;
+
+ WARN_ON(!spin_is_locked(&__efivars->lock));
+
+ list_for_each_entry_safe(entry, n, head, list) {
- status = check_var_size(attributes, *size + utf16_strsize(name, 1024));
++ strsize1 = ucs2_strsize(name, 1024);
++ strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
+ if (strsize1 == strsize2 &&
+ !memcmp(name, &(entry->var.VariableName), strsize1) &&
+ !efi_guidcmp(guid, entry->var.VendorGuid)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return NULL;
+
+ if (remove)
+ list_del(&entry->list);
+
+ return entry;
+}
+EXPORT_SYMBOL_GPL(efivar_entry_find);
+
+/**
+ * __efivar_entry_size - obtain the size of a variable
+ * @entry: entry for this variable
+ * @size: location to store the variable's size
+ *
+ * The caller MUST call efivar_entry_iter_begin() and
+ * efivar_entry_iter_end() before and after the invocation of this
+ * function, respectively.
+ */
+int __efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+
+ WARN_ON(!spin_is_locked(&__efivars->lock));
+
+ *size = 0;
+ status = ops->get_variable(entry->var.VariableName,
+ &entry->var.VendorGuid, NULL, size, NULL);
+ if (status != EFI_BUFFER_TOO_SMALL)
+ return efi_status_to_err(status);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__efivar_entry_size);
+
+/**
+ * efivar_entry_size - obtain the size of a variable
+ * @entry: entry for this variable
+ * @size: location to store the variable's size
+ */
+int efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+
+ *size = 0;
+
+ spin_lock_irq(&__efivars->lock);
+ status = ops->get_variable(entry->var.VariableName,
+ &entry->var.VendorGuid, NULL, size, NULL);
+ spin_unlock_irq(&__efivars->lock);
+
+ if (status != EFI_BUFFER_TOO_SMALL)
+ return efi_status_to_err(status);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(efivar_entry_size);
+
+/**
+ * efivar_entry_get - call get_variable()
+ * @entry: read data for this variable
+ * @attributes: variable attributes
+ * @size: size of @data buffer
+ * @data: buffer to store variable data
+ */
+int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
+ unsigned long *size, void *data)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_status_t status;
+
+ spin_lock_irq(&__efivars->lock);
+ status = ops->get_variable(entry->var.VariableName,
+ &entry->var.VendorGuid,
+ attributes, size, data);
+ spin_unlock_irq(&__efivars->lock);
+
+ return efi_status_to_err(status);
+}
+EXPORT_SYMBOL_GPL(efivar_entry_get);
+
+/**
+ * efivar_entry_set_get_size - call set_variable() and get new size (atomic)
+ * @entry: entry containing variable to set and get
+ * @attributes: attributes of variable to be written
+ * @size: size of data buffer
+ * @data: buffer containing data to write
+ * @set: did the set_variable() call succeed?
+ *
+ * This is a pretty special (complex) function. See efivarfs_file_write().
+ *
+ * Atomically call set_variable() for @entry and if the call is
+ * successful, return the new size of the variable from get_variable()
+ * in @size. The success of set_variable() is indicated by @set.
+ *
+ * Returns 0 on success, -EINVAL if the variable data is invalid,
+ * -ENOSPC if the firmware does not have enough available space, or a
+ * converted EFI status code if either of set_variable() or
+ * get_variable() fail.
+ *
+ * If the EFI variable does not exist when calling set_variable()
+ * (EFI_NOT_FOUND), @entry is removed from the variable list.
+ */
+int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
+ unsigned long *size, void *data, bool *set)
+{
+ const struct efivar_operations *ops = __efivars->ops;
+ efi_char16_t *name = entry->var.VariableName;
+ efi_guid_t *vendor = &entry->var.VendorGuid;
+ efi_status_t status;
+ int err;
+
+ *set = false;
+
+ if (efivar_validate(&entry->var, data, *size) == false)
+ return -EINVAL;
+
+ /*
+ * The lock here protects the get_variable call, the conditional
+ * set_variable call, and removal of the variable from the efivars
+ * list (in the case of an authenticated delete).
+ */
+ spin_lock_irq(&__efivars->lock);
+
+ /*
+ * Ensure that the available space hasn't shrunk below the safe level
+ */
++ status = check_var_size(attributes, *size + ucs2_strsize(name, 1024));
+ if (status != EFI_SUCCESS) {
+ if (status != EFI_UNSUPPORTED) {
+ err = efi_status_to_err(status);
+ goto out;
+ }
+
+ if (*size > 65536) {
+ err = -ENOSPC;
+ goto out;
+ }
+ }
+
+ status = ops->set_variable(name, vendor, attributes, *size, data);
+ if (status != EFI_SUCCESS) {
+ err = efi_status_to_err(status);
+ goto out;
+ }
+
+ *set = true;
+
+ /*
+ * Writing to the variable may have caused a change in size (which
+ * could either be an append or an overwrite), or the variable to be
+ * deleted. Perform a GetVariable() so we can tell what actually
+ * happened.
+ */
+ *size = 0;
+ status = ops->get_variable(entry->var.VariableName,
+ &entry->var.VendorGuid,
+ NULL, size, NULL);
+
+ if (status == EFI_NOT_FOUND)
+ efivar_entry_list_del_unlock(entry);
+ else
+ spin_unlock_irq(&__efivars->lock);
+
+ if (status && status != EFI_BUFFER_TOO_SMALL)
+ return efi_status_to_err(status);
+
+ return 0;
+
+out:
+ spin_unlock_irq(&__efivars->lock);
+ return err;
+
+}
+EXPORT_SYMBOL_GPL(efivar_entry_set_get_size);
+
+/**
+ * efivar_entry_iter_begin - begin iterating the variable list
+ *
+ * Lock the variable list to prevent entry insertion and removal until
+ * efivar_entry_iter_end() is called. This function is usually used in
+ * conjunction with __efivar_entry_iter() or efivar_entry_iter().
+ */
+void efivar_entry_iter_begin(void)
+{
+ spin_lock_irq(&__efivars->lock);
+}
+EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
+
+/**
+ * efivar_entry_iter_end - finish iterating the variable list
+ *
+ * Unlock the variable list and allow modifications to the list again.
+ */
+void efivar_entry_iter_end(void)
+{
+ spin_unlock_irq(&__efivars->lock);
+}
+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_enter_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
+ * @head: head of variable list
+ * @data: function-specific data to pass to callback
+ *
+ * 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() while iterating.
+ *
+ * Some notes for the callback function:
+ * - a non-zero return value indicates an error and terminates the loop
+ * - @func is called from atomic context
+ */
+int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
+ struct list_head *head, void *data)
+{
+ int err = 0;
+
+ efivar_entry_iter_begin();
+ err = __efivar_entry_iter(func, head, data, NULL);
+ efivar_entry_iter_end();
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(efivar_entry_iter);
+
+/**
+ * efivars_kobject - get the kobject for the registered efivars
+ *
+ * If efivars_register() has not been called we return NULL,
+ * otherwise return the kobject used at registration time.
+ */
+struct kobject *efivars_kobject(void)
+{
+ if (!__efivars)
+ return NULL;
+
+ return __efivars->kobject;
+}
+EXPORT_SYMBOL_GPL(efivars_kobject);
+
+/**
+ * efivar_run_worker - schedule the efivar worker thread
+ */
+void efivar_run_worker(void)
+{
+ if (efivar_wq_enabled)
+ schedule_work(&efivar_work);
+}
+EXPORT_SYMBOL_GPL(efivar_run_worker);
+
+/**
+ * efivars_register - register an efivars
+ * @efivars: efivars to register
+ * @ops: efivars operations
+ * @kobject: @efivars-specific kobject
+ *
+ * Only a single efivars can be registered at any time.
+ */
+int efivars_register(struct efivars *efivars,
+ const struct efivar_operations *ops,
+ struct kobject *kobject)
+{
+ spin_lock_init(&efivars->lock);
+ efivars->ops = ops;
+ efivars->kobject = kobject;
+
+ __efivars = efivars;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(efivars_register);
+
+/**
+ * efivars_unregister - unregister an efivars
+ * @efivars: efivars to unregister
+ *
+ * The caller must have already removed every entry from the list,
+ * failure to do so is an error.
+ */
+int efivars_unregister(struct efivars *efivars)
+{
+ int rv;
+
+ if (!__efivars) {
+ printk(KERN_ERR "efivars not registered\n");
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (__efivars != efivars) {
+ rv = -EINVAL;
+ goto out;
+ }
+
+ __efivars = NULL;
+
+ rv = 0;
+out:
+ return rv;
+}
+EXPORT_SYMBOL_GPL(efivars_unregister);
#include <linux/reboot.h>
#include <linux/efi.h>
#include <linux/module.h>
++#include <linux/ucs2_string.h>
#define GSMI_SHUTDOWN_CLEAN 0 /* Clean Shutdown */
/* TODO(mikew@google.com): Tie in HARDLOCKUP_DETECTOR with NMIWDT */
};
efi_status_t ret = EFI_SUCCESS;
unsigned long flags;
- size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
- size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
++ size_t name_len = ucs2_strnlen(name, GSMI_BUF_SIZE / 2);
int rc;
if (name_len >= GSMI_BUF_SIZE / 2)
return EFI_BAD_BUFFER_SIZE;
/* Let's make sure the thing is at least null-terminated */
- if (utf16_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
- if (utf16_strlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
++ if (ucs2_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
return EFI_INVALID_PARAMETER;
spin_lock_irqsave(&gsmi_dev.lock, flags);
/* Copy the name back */
memcpy(name, gsmi_dev.name_buf->start, GSMI_BUF_SIZE);
- *name_size = utf16_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
- *name_size = utf16_strlen(name, GSMI_BUF_SIZE / 2) * 2;
++ *name_size = ucs2_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
/* copy guid to return buffer */
memcpy(vendor, ¶m.guid, sizeof(param.guid));
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
};
- size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
- size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
++ size_t name_len = ucs2_strnlen(name, GSMI_BUF_SIZE / 2);
efi_status_t ret = EFI_SUCCESS;
int rc;
unsigned long flags;
--- /dev/null
- len = utf16_strlen(entry->var.VariableName);
+/*
+ * Copyright (C) 2012 Red Hat, Inc.
+ * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/ctype.h>
+#include <linux/efi.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
++#include <linux/ucs2_string.h>
+
+#include "internal.h"
+
+LIST_HEAD(efivarfs_list);
+
+static void efivarfs_evict_inode(struct inode *inode)
+{
+ clear_inode(inode);
+}
+
+static const struct super_operations efivarfs_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .evict_inode = efivarfs_evict_inode,
+ .show_options = generic_show_options,
+};
+
+static struct super_block *efivarfs_sb;
+
+/*
+ * Compare two efivarfs file names.
+ *
+ * An efivarfs filename is composed of two parts,
+ *
+ * 1. A case-sensitive variable name
+ * 2. A case-insensitive GUID
+ *
+ * So we need to perform a case-sensitive match on part 1 and a
+ * case-insensitive match on part 2.
+ */
+static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode,
+ const struct dentry *dentry, const struct inode *inode,
+ unsigned int len, const char *str,
+ const struct qstr *name)
+{
+ int guid = len - EFI_VARIABLE_GUID_LEN;
+
+ if (name->len != len)
+ return 1;
+
+ /* Case-sensitive compare for the variable name */
+ if (memcmp(str, name->name, guid))
+ return 1;
+
+ /* Case-insensitive compare for the GUID */
+ return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);
+}
+
+static int efivarfs_d_hash(const struct dentry *dentry,
+ const struct inode *inode, struct qstr *qstr)
+{
+ unsigned long hash = init_name_hash();
+ const unsigned char *s = qstr->name;
+ unsigned int len = qstr->len;
+
+ if (!efivarfs_valid_name(s, len))
+ return -EINVAL;
+
+ while (len-- > EFI_VARIABLE_GUID_LEN)
+ hash = partial_name_hash(*s++, hash);
+
+ /* GUID is case-insensitive. */
+ while (len--)
+ hash = partial_name_hash(tolower(*s++), hash);
+
+ qstr->hash = end_name_hash(hash);
+ return 0;
+}
+
+/*
+ * Retaining negative dentries for an in-memory filesystem just wastes
+ * memory and lookup time: arrange for them to be deleted immediately.
+ */
+static int efivarfs_delete_dentry(const struct dentry *dentry)
+{
+ return 1;
+}
+
+static struct dentry_operations efivarfs_d_ops = {
+ .d_compare = efivarfs_d_compare,
+ .d_hash = efivarfs_d_hash,
+ .d_delete = efivarfs_delete_dentry,
+};
+
+static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
+{
+ struct dentry *d;
+ struct qstr q;
+ int err;
+
+ q.name = name;
+ q.len = strlen(name);
+
+ err = efivarfs_d_hash(NULL, NULL, &q);
+ if (err)
+ return ERR_PTR(err);
+
+ d = d_alloc(parent, &q);
+ if (d)
+ return d;
+
+ return ERR_PTR(-ENOMEM);
+}
+
+static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
+ unsigned long name_size, void *data)
+{
+ struct super_block *sb = (struct super_block *)data;
+ struct efivar_entry *entry;
+ struct inode *inode = NULL;
+ struct dentry *dentry, *root = sb->s_root;
+ unsigned long size = 0;
+ char *name;
+ int len, i;
+ int err = -ENOMEM;
+
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return err;
+
+ memcpy(entry->var.VariableName, name16, name_size);
+ memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
+
++ len = ucs2_strlen(entry->var.VariableName);
+
+ /* name, plus '-', plus GUID, plus NUL*/
+ name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);
+ if (!name)
+ goto fail;
+
+ for (i = 0; i < len; i++)
+ name[i] = entry->var.VariableName[i] & 0xFF;
+
+ name[len] = '-';
+
+ efi_guid_unparse(&entry->var.VendorGuid, name + len + 1);
+
+ name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';
+
+ inode = efivarfs_get_inode(sb, root->d_inode, S_IFREG | 0644, 0);
+ if (!inode)
+ goto fail_name;
+
+ dentry = efivarfs_alloc_dentry(root, name);
+ if (IS_ERR(dentry)) {
+ err = PTR_ERR(dentry);
+ goto fail_inode;
+ }
+
+ /* copied by the above to local storage in the dentry. */
+ kfree(name);
+
+ efivar_entry_size(entry, &size);
+ efivar_entry_add(entry, &efivarfs_list);
+
+ mutex_lock(&inode->i_mutex);
+ inode->i_private = entry;
+ i_size_write(inode, size + sizeof(entry->var.Attributes));
+ mutex_unlock(&inode->i_mutex);
+ d_add(dentry, inode);
+
+ return 0;
+
+fail_inode:
+ iput(inode);
+fail_name:
+ kfree(name);
+fail:
+ kfree(entry);
+ return err;
+}
+
+static int efivarfs_destroy(struct efivar_entry *entry, void *data)
+{
+ efivar_entry_remove(entry);
+ kfree(entry);
+ return 0;
+}
+
+static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *inode = NULL;
+ struct dentry *root;
+ int err;
+
+ efivarfs_sb = sb;
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = EFIVARFS_MAGIC;
+ sb->s_op = &efivarfs_ops;
+ sb->s_d_op = &efivarfs_d_ops;
+ sb->s_time_gran = 1;
+
+ inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0);
+ if (!inode)
+ return -ENOMEM;
+ inode->i_op = &efivarfs_dir_inode_operations;
+
+ root = d_make_root(inode);
+ sb->s_root = root;
+ if (!root)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&efivarfs_list);
+
+ err = efivar_init(efivarfs_callback, (void *)sb, false,
+ true, &efivarfs_list);
+ if (err)
+ __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
+
+ return err;
+}
+
+static struct dentry *efivarfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_single(fs_type, flags, data, efivarfs_fill_super);
+}
+
+static void efivarfs_kill_sb(struct super_block *sb)
+{
+ kill_litter_super(sb);
+ efivarfs_sb = NULL;
+
+ /* Remove all entries and destroy */
+ __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
+}
+
+static struct file_system_type efivarfs_type = {
+ .name = "efivarfs",
+ .mount = efivarfs_mount,
+ .kill_sb = efivarfs_kill_sb,
+};
+
+static __init int efivarfs_init(void)
+{
+ if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ return 0;
+
+ if (!efivars_kobject())
+ return 0;
+
+ return register_filesystem(&efivarfs_type);
+}
+
+MODULE_AUTHOR("Matthew Garrett, Jeremy Kerr");
+MODULE_DESCRIPTION("EFI Variable Filesystem");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_FS("efivarfs");
+
+module_init(efivarfs_init);
*addr &= PAGE_MASK;
}
- /* Return the number of unicode characters in data */
- static inline unsigned long
- utf16_strnlen(efi_char16_t *s, size_t maxlength)
- {
- unsigned long length = 0;
-
- while (*s++ != 0 && length < maxlength)
- length++;
- return length;
- }
-
- static inline unsigned long
- utf16_strlen(efi_char16_t *s)
- {
- return utf16_strnlen(s, ~0UL);
- }
-
- /*
- * Return the number of bytes is the length of this string
- * Note: this is NOT the same as the number of unicode characters
- */
- static inline unsigned long
- utf16_strsize(efi_char16_t *data, unsigned long maxlength)
- {
- return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);
- }
-
- static inline int
- utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len)
- {
- while (1) {
- if (len == 0)
- return 0;
- if (*a < *b)
- return -1;
- if (*a > *b)
- return 1;
- if (*a == 0) /* implies *b == 0 */
- return 0;
- a++;
- b++;
- len--;
- }
- }
-
-#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
/*
* EFI Variable support.
*
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff