* [PATCH 1/6] efi: move utf16 string functions to efi.h
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-09 22:00 ` Mike Waychison
2013-04-04 12:18 ` [PATCH 2/6] efivars: Keep a private global pointer to efivars Matt Fleming
` (5 subsequent siblings)
6 siblings, 1 reply; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi; +Cc: linux-kernel, Matt Fleming, Tom Gundersen, Mike Waychison
From: Matt Fleming <matt.fleming@intel.com>
There are currently two implementations of the utf16 string functions.
Somewhat confusingly, they've got different names.
Centralise the functions in efi.h.
Cc: Tom Gundersen <teg@jklm.no>
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
drivers/firmware/efivars.c | 17 -----------------
drivers/firmware/google/gsmi.c | 19 ++++---------------
include/linux/efi.h | 17 +++++++++++++++++
3 files changed, 21 insertions(+), 32 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 7acafb8..34c8783 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -172,23 +172,6 @@ static void efivar_update_sysfs_entries(struct work_struct *);
static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
static bool efivar_wq_enabled = true;
-/* Return the number of unicode characters in data */
-static 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
diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
index 91ddf0f..c409a75 100644
--- a/drivers/firmware/google/gsmi.c
+++ b/drivers/firmware/google/gsmi.c
@@ -288,17 +288,6 @@ static int gsmi_exec(u8 func, u8 sub)
return rc;
}
-/* Return the number of unicode characters in data */
-static size_t
-utf16_strlen(efi_char16_t *data, unsigned long maxlength)
-{
- unsigned long length = 0;
-
- while (*data++ != 0 && length < maxlength)
- length++;
- return length;
-}
-
static efi_status_t gsmi_get_variable(efi_char16_t *name,
efi_guid_t *vendor, u32 *attr,
unsigned long *data_size,
@@ -311,7 +300,7 @@ static efi_status_t gsmi_get_variable(efi_char16_t *name,
};
efi_status_t ret = EFI_SUCCESS;
unsigned long flags;
- size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
+ size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
int rc;
if (name_len >= GSMI_BUF_SIZE / 2)
@@ -380,7 +369,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
return EFI_BAD_BUFFER_SIZE;
/* Let's make sure the thing is at least null-terminated */
- if (utf16_strlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
+ if (utf16_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
return EFI_INVALID_PARAMETER;
spin_lock_irqsave(&gsmi_dev.lock, flags);
@@ -408,7 +397,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
/* Copy the name back */
memcpy(name, gsmi_dev.name_buf->start, GSMI_BUF_SIZE);
- *name_size = utf16_strlen(name, GSMI_BUF_SIZE / 2) * 2;
+ *name_size = utf16_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
/* copy guid to return buffer */
memcpy(vendor, ¶m.guid, sizeof(param.guid));
@@ -434,7 +423,7 @@ static efi_status_t gsmi_set_variable(efi_char16_t *name,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
};
- size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
+ size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
efi_status_t ret = EFI_SUCCESS;
int rc;
unsigned long flags;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 9bf2f1f..d1d782a 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -719,6 +719,23 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
*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);
+}
+
#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
/*
* EFI Variable support.
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* Re: [PATCH 1/6] efi: move utf16 string functions to efi.h
2013-04-04 12:18 ` [PATCH 1/6] efi: move utf16 string functions to efi.h Matt Fleming
@ 2013-04-09 22:00 ` Mike Waychison
2013-04-10 11:18 ` David Woodhouse
0 siblings, 1 reply; 17+ messages in thread
From: Mike Waychison @ 2013-04-09 22:00 UTC (permalink / raw)
To: Matt Fleming; +Cc: linux-efi, linux-kernel, Matt Fleming, Tom Gundersen
fwiw, I was tempted to rename these to ucs2_*() last time I was here.
Reviewed-by: Mike Waychison <mikew@google.com>
On Thu, Apr 4, 2013 at 5:18 AM, Matt Fleming <matt@console-pimps.org> wrote:
> From: Matt Fleming <matt.fleming@intel.com>
>
> There are currently two implementations of the utf16 string functions.
> Somewhat confusingly, they've got different names.
>
> Centralise the functions in efi.h.
>
> Cc: Tom Gundersen <teg@jklm.no>
> Cc: Mike Waychison <mikew@google.com>
> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
> ---
> drivers/firmware/efivars.c | 17 -----------------
> drivers/firmware/google/gsmi.c | 19 ++++---------------
> include/linux/efi.h | 17 +++++++++++++++++
> 3 files changed, 21 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
> index 7acafb8..34c8783 100644
> --- a/drivers/firmware/efivars.c
> +++ b/drivers/firmware/efivars.c
> @@ -172,23 +172,6 @@ static void efivar_update_sysfs_entries(struct work_struct *);
> static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
> static bool efivar_wq_enabled = true;
>
> -/* Return the number of unicode characters in data */
> -static 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
> diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
> index 91ddf0f..c409a75 100644
> --- a/drivers/firmware/google/gsmi.c
> +++ b/drivers/firmware/google/gsmi.c
> @@ -288,17 +288,6 @@ static int gsmi_exec(u8 func, u8 sub)
> return rc;
> }
>
> -/* Return the number of unicode characters in data */
> -static size_t
> -utf16_strlen(efi_char16_t *data, unsigned long maxlength)
> -{
> - unsigned long length = 0;
> -
> - while (*data++ != 0 && length < maxlength)
> - length++;
> - return length;
> -}
> -
> static efi_status_t gsmi_get_variable(efi_char16_t *name,
> efi_guid_t *vendor, u32 *attr,
> unsigned long *data_size,
> @@ -311,7 +300,7 @@ static efi_status_t gsmi_get_variable(efi_char16_t *name,
> };
> efi_status_t ret = EFI_SUCCESS;
> unsigned long flags;
> - size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
> + size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
> int rc;
>
> if (name_len >= GSMI_BUF_SIZE / 2)
> @@ -380,7 +369,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
> return EFI_BAD_BUFFER_SIZE;
>
> /* Let's make sure the thing is at least null-terminated */
> - if (utf16_strlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
> + if (utf16_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
> return EFI_INVALID_PARAMETER;
>
> spin_lock_irqsave(&gsmi_dev.lock, flags);
> @@ -408,7 +397,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
>
> /* Copy the name back */
> memcpy(name, gsmi_dev.name_buf->start, GSMI_BUF_SIZE);
> - *name_size = utf16_strlen(name, GSMI_BUF_SIZE / 2) * 2;
> + *name_size = utf16_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
>
> /* copy guid to return buffer */
> memcpy(vendor, ¶m.guid, sizeof(param.guid));
> @@ -434,7 +423,7 @@ static efi_status_t gsmi_set_variable(efi_char16_t *name,
> EFI_VARIABLE_BOOTSERVICE_ACCESS |
> EFI_VARIABLE_RUNTIME_ACCESS,
> };
> - size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
> + size_t name_len = utf16_strnlen(name, GSMI_BUF_SIZE / 2);
> efi_status_t ret = EFI_SUCCESS;
> int rc;
> unsigned long flags;
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 9bf2f1f..d1d782a 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -719,6 +719,23 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
> *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);
> +}
> +
> #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
> /*
> * EFI Variable support.
> --
> 1.7.10.4
>
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH 1/6] efi: move utf16 string functions to efi.h
2013-04-09 22:00 ` Mike Waychison
@ 2013-04-10 11:18 ` David Woodhouse
0 siblings, 0 replies; 17+ messages in thread
From: David Woodhouse @ 2013-04-10 11:18 UTC (permalink / raw)
To: Mike Waychison
Cc: Matt Fleming, linux-efi, linux-kernel, Matt Fleming, Tom Gundersen
[-- Attachment #1: Type: text/plain, Size: 718 bytes --]
On Tue, 2013-04-09 at 15:00 -0700, Mike Waychison wrote:
> fwiw, I was tempted to rename these to ucs2_*() last time I was here.
We should definitely do that. The functions aren't implementing UTF-16.
Note that Windows *does* now implement UTF16 I think, but EFI still
claims to be UCS2 only.
If I interpret this correctly, the claim is basically that Windows was
"always" actually UTF16, but just never used any of the code points
where you'd be able to notice the difference:
http://blogs.msdn.com/b/michkap/archive/2005/05/11/416552.aspx
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
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[-- Type: application/x-pkcs7-signature, Size: 6171 bytes --]
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/6] efivars: Keep a private global pointer to efivars
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
2013-04-04 12:18 ` [PATCH 1/6] efi: move utf16 string functions to efi.h Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-09 22:07 ` Mike Waychison
2013-04-04 12:18 ` [PATCH 3/6] efivars: efivar_entry API Matt Fleming
` (4 subsequent siblings)
6 siblings, 1 reply; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi; +Cc: linux-kernel, Matt Fleming, Tom Gundersen, Mike Waychison
From: Matt Fleming <matt.fleming@intel.com>
Some machines have an EFI variable interface that does not conform to the UEFI
specification, e.g. CONFIG_GOOGLE_SMI. Add the necessary code and Kconfig glue
so that it's only possible to select one implementation of EFI variable
operations. This allows us to keep a single (file-scope) global pointer 'struct
efivars', which simplifies access. This will hopefully dissuade developers from
accessing the generic operations struct directly in the future, as was done in
the efivarfs and pstore code, thereby allowing future code to work with both
the generic efivar ops and the google SMI ops.
This may seem like a step backwards in terms of modularity, but we don't need
to track more than one 'struct efivars' at one time. There is no
synchronisation done between multiple EFI variable operations, and according to
Mike no one is using both the generic EFI var ops and CONFIG_GOOGLE_SMI. It
also helps to clearly highlight which functions form the core of the efivars
interface - those that require access to __efivars.
Note that because of the Kconfig rules, we don't need to use any kind of
synchronisation primitive in register_efivars() - it's not possible to compile
more than one set of EFI variable operations into the kernel.
Cc: Tom Gundersen <teg@jklm.no>
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
drivers/firmware/Kconfig | 6 +++
drivers/firmware/efivars.c | 91 +++++++++++++++++++++++++++-----------------
2 files changed, 63 insertions(+), 34 deletions(-)
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 42c759a..96d84ad 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -53,6 +53,12 @@ config EFI_VARS
Subsequent efibootmgr releases may be found at:
<http://linux.dell.com/efibootmgr>
+config EFI_VARS_GENERIC_OPS
+ bool
+ depends on EFI
+ depends on !GOOGLE_SMI
+ default y
+
config EFI_VARS_PSTORE
bool "Register efivars backend for pstore"
depends on EFI_VARS && PSTORE
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 34c8783..721d200 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -125,7 +125,6 @@ struct efi_variable {
} __attribute__((packed));
struct efivar_entry {
- struct efivars *efivars;
struct efi_variable var;
struct list_head list;
struct kobject kobj;
@@ -137,8 +136,8 @@ struct efivar_attribute {
ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
};
-static struct efivars __efivars;
-static struct efivar_operations ops;
+/* Private pointer to registered efivars */
+static struct efivars *__efivars;
#define PSTORE_EFI_ATTRIBUTES \
(EFI_VARIABLE_NON_VOLATILE | \
@@ -479,7 +478,7 @@ efivar_attr_read(struct efivar_entry *entry, char *buf)
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(entry->efivars, var);
+ status = get_var_data(__efivars, var);
if (status != EFI_SUCCESS)
return -EIO;
@@ -513,7 +512,7 @@ efivar_size_read(struct efivar_entry *entry, char *buf)
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(entry->efivars, var);
+ status = get_var_data(__efivars, var);
if (status != EFI_SUCCESS)
return -EIO;
@@ -530,7 +529,7 @@ efivar_data_read(struct efivar_entry *entry, char *buf)
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(entry->efivars, var);
+ status = get_var_data(__efivars, var);
if (status != EFI_SUCCESS)
return -EIO;
@@ -545,7 +544,7 @@ static ssize_t
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
{
struct efi_variable *new_var, *var = &entry->var;
- struct efivars *efivars = entry->efivars;
+ struct efivars *efivars = __efivars;
efi_status_t status = EFI_NOT_FOUND;
if (count != sizeof(struct efi_variable))
@@ -606,7 +605,7 @@ efivar_show_raw(struct efivar_entry *entry, char *buf)
if (!entry || !buf)
return 0;
- status = get_var_data(entry->efivars, var);
+ status = get_var_data(__efivars, var);
if (status != EFI_SUCCESS)
return -EIO;
@@ -728,7 +727,7 @@ static ssize_t efivarfs_file_write(struct file *file,
const char __user *userbuf, size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
- struct efivars *efivars;
+ struct efivars *efivars = __efivars;
efi_status_t status;
void *data;
u32 attributes;
@@ -746,8 +745,6 @@ static ssize_t efivarfs_file_write(struct file *file,
if (attributes & ~(EFI_VARIABLE_MASK))
return -EINVAL;
- efivars = var->efivars;
-
/*
* Ensure that the user can't allocate arbitrarily large
* amounts of memory. Pick a default size of 64K if
@@ -855,7 +852,7 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
- struct efivars *efivars = var->efivars;
+ struct efivars *efivars = __efivars;
efi_status_t status;
unsigned long datasize = 0;
u32 attributes;
@@ -1009,7 +1006,7 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
struct inode *inode;
- struct efivars *efivars = &__efivars;
+ struct efivars *efivars = __efivars;
struct efivar_entry *var;
int namelen, i = 0, err = 0;
@@ -1038,7 +1035,6 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
var->var.VariableName[i] = '\0';
inode->i_private = var;
- var->efivars = efivars;
var->kobj.kset = efivars->kset;
err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s",
@@ -1063,7 +1059,7 @@ out:
static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct efivar_entry *var = dentry->d_inode->i_private;
- struct efivars *efivars = var->efivars;
+ struct efivars *efivars = __efivars;
efi_status_t status;
spin_lock_irq(&efivars->lock);
@@ -1175,7 +1171,7 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode = NULL;
struct dentry *root;
struct efivar_entry *entry, *n;
- struct efivars *efivars = &__efivars;
+ struct efivars *efivars = __efivars;
char *name;
int err = -ENOMEM;
@@ -1302,7 +1298,7 @@ static const struct inode_operations efivarfs_dir_inode_operations = {
static int efi_pstore_open(struct pstore_info *psi)
{
- struct efivars *efivars = psi->data;
+ struct efivars *efivars = __efivars;
spin_lock_irq(&efivars->lock);
efivars->walk_entry = list_first_entry(&efivars->list,
@@ -1312,7 +1308,7 @@ static int efi_pstore_open(struct pstore_info *psi)
static int efi_pstore_close(struct pstore_info *psi)
{
- struct efivars *efivars = psi->data;
+ struct efivars *efivars = __efivars;
spin_unlock_irq(&efivars->lock);
return 0;
@@ -1323,7 +1319,7 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
char **buf, struct pstore_info *psi)
{
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- struct efivars *efivars = psi->data;
+ struct efivars *efivars = __efivars;
char name[DUMP_NAME_LEN];
int i;
int cnt;
@@ -1386,7 +1382,7 @@ static int efi_pstore_write(enum pstore_type_id type,
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- struct efivars *efivars = psi->data;
+ struct efivars *efivars = __efivars;
int i, ret = 0;
efi_status_t status = EFI_NOT_FOUND;
unsigned long flags;
@@ -1443,7 +1439,7 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
char name_old[DUMP_NAME_LEN];
efi_char16_t efi_name_old[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- struct efivars *efivars = psi->data;
+ struct efivars *efivars = __efivars;
struct efivar_entry *entry, *found = NULL;
int i;
@@ -1535,7 +1531,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
char *buf, loff_t pos, size_t count)
{
struct efi_variable *new_var = (struct efi_variable *)buf;
- struct efivars *efivars = bin_attr->private;
+ struct efivars *efivars = __efivars;
struct efivar_entry *search_efivar, *n;
unsigned long strsize1, strsize2;
efi_status_t status = EFI_NOT_FOUND;
@@ -1612,7 +1608,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
char *buf, loff_t pos, size_t count)
{
struct efi_variable *del_var = (struct efi_variable *)buf;
- struct efivars *efivars = bin_attr->private;
+ struct efivars *efivars = __efivars;
struct efivar_entry *search_efivar, *n;
unsigned long strsize1, strsize2;
efi_status_t status = EFI_NOT_FOUND;
@@ -1670,7 +1666,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor)
{
struct efivar_entry *entry, *n;
- struct efivars *efivars = &__efivars;
+ struct efivars *efivars = __efivars;
unsigned long strsize1, strsize2;
bool found = false;
@@ -1716,7 +1712,7 @@ static unsigned long var_name_strnsize(efi_char16_t *variable_name,
static void efivar_update_sysfs_entries(struct work_struct *work)
{
- struct efivars *efivars = &__efivars;
+ struct efivars *efivars = __efivars;
efi_guid_t vendor;
efi_char16_t *variable_name;
unsigned long variable_name_size = 1024;
@@ -1843,7 +1839,6 @@ efivar_create_sysfs_entry(struct efivars *efivars,
return 1;
}
- new_efivar->efivars = efivars;
memcpy(new_efivar->var.VariableName, variable_name,
variable_name_size);
memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t));
@@ -1942,6 +1937,8 @@ void unregister_efivars(struct efivars *efivars)
{
struct efivar_entry *entry, *n;
+ __efivars = NULL;
+
list_for_each_entry_safe(entry, n, &efivars->list, list) {
spin_lock_irq(&efivars->lock);
list_del(&entry->list);
@@ -1998,6 +1995,8 @@ int register_efivars(struct efivars *efivars,
unsigned long variable_name_size = 1024;
int error = 0;
+ __efivars = efivars;
+
variable_name = kzalloc(variable_name_size, GFP_KERNEL);
if (!variable_name) {
printk(KERN_ERR "efivars: Memory allocation failed.\n");
@@ -2085,6 +2084,35 @@ out:
}
EXPORT_SYMBOL_GPL(register_efivars);
+#ifdef CONFIG_EFI_VARS_GENERIC_OPS
+static struct efivars generic_efivars;
+static struct efivar_operations generic_ops;
+
+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_info = efi.query_variable_info;
+
+ return register_efivars(&generic_efivars, &generic_ops, efi_kobj);
+}
+
+void generic_ops_unregister(void)
+{
+ unregister_efivars(&generic_efivars);
+}
+#else
+static inline int generic_ops_register(void)
+{
+ return 0;
+}
+
+static inline void generic_ops_unregister(void)
+{
+}
+#endif /* CONFIG_EFI_VARS_GENERIC_OPS */
+
/*
* For now we register the efi subsystem with the firmware subsystem
* and the vars subsystem with the efi subsystem. In the future, it
@@ -2111,12 +2139,7 @@ efivars_init(void)
return -ENOMEM;
}
- ops.get_variable = efi.get_variable;
- ops.set_variable = efi.set_variable;
- ops.get_next_variable = efi.get_next_variable;
- ops.query_variable_info = efi.query_variable_info;
-
- error = register_efivars(&__efivars, &ops, efi_kobj);
+ error = generic_ops_register();
if (error)
goto err_put;
@@ -2132,7 +2155,7 @@ efivars_init(void)
return 0;
err_unregister:
- unregister_efivars(&__efivars);
+ generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
return error;
@@ -2144,7 +2167,7 @@ efivars_exit(void)
cancel_work_sync(&efivar_work);
if (efi_enabled(EFI_RUNTIME_SERVICES)) {
- unregister_efivars(&__efivars);
+ generic_ops_unregister();
kobject_put(efi_kobj);
}
}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* Re: [PATCH 2/6] efivars: Keep a private global pointer to efivars
2013-04-04 12:18 ` [PATCH 2/6] efivars: Keep a private global pointer to efivars Matt Fleming
@ 2013-04-09 22:07 ` Mike Waychison
2013-04-11 13:10 ` Matt Fleming
0 siblings, 1 reply; 17+ messages in thread
From: Mike Waychison @ 2013-04-09 22:07 UTC (permalink / raw)
To: Matt Fleming; +Cc: linux-efi, linux-kernel, Matt Fleming, Tom Gundersen
On Thu, Apr 4, 2013 at 5:18 AM, Matt Fleming <matt@console-pimps.org> wrote:
> From: Matt Fleming <matt.fleming@intel.com>
>
> Some machines have an EFI variable interface that does not conform to the UEFI
> specification, e.g. CONFIG_GOOGLE_SMI. Add the necessary code and Kconfig glue
> so that it's only possible to select one implementation of EFI variable
> operations. This allows us to keep a single (file-scope) global pointer 'struct
> efivars', which simplifies access. This will hopefully dissuade developers from
> accessing the generic operations struct directly in the future, as was done in
> the efivarfs and pstore code, thereby allowing future code to work with both
> the generic efivar ops and the google SMI ops.
>
> This may seem like a step backwards in terms of modularity, but we don't need
> to track more than one 'struct efivars' at one time. There is no
> synchronisation done between multiple EFI variable operations, and according to
> Mike no one is using both the generic EFI var ops and CONFIG_GOOGLE_SMI. It
> also helps to clearly highlight which functions form the core of the efivars
> interface - those that require access to __efivars.
>
> Note that because of the Kconfig rules, we don't need to use any kind of
> synchronisation primitive in register_efivars() - it's not possible to compile
> more than one set of EFI variable operations into the kernel.
>
> Cc: Tom Gundersen <teg@jklm.no>
> Cc: Mike Waychison <mikew@google.com>
> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
> ---
> drivers/firmware/Kconfig | 6 +++
> drivers/firmware/efivars.c | 91 +++++++++++++++++++++++++++-----------------
> 2 files changed, 63 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index 42c759a..96d84ad 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -53,6 +53,12 @@ config EFI_VARS
> Subsequent efibootmgr releases may be found at:
> <http://linux.dell.com/efibootmgr>
>
> +config EFI_VARS_GENERIC_OPS
> + bool
> + depends on EFI
> + depends on !GOOGLE_SMI
> + default y
> +
So while we have no need to support both the gsmi and real efi
entrypoints on any given machine, we still need to be able to support
the operation of both from the same kernel build. How do you feel
about removing this bit and leaving it such that efivars_init
continues to register the "generic" efivars regardless of
CONFIG_GOOGLE_SMI? The rest of the patch seems fine to me.
> config EFI_VARS_PSTORE
> bool "Register efivars backend for pstore"
> depends on EFI_VARS && PSTORE
> diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
> index 34c8783..721d200 100644
> --- a/drivers/firmware/efivars.c
> +++ b/drivers/firmware/efivars.c
> @@ -125,7 +125,6 @@ struct efi_variable {
> } __attribute__((packed));
>
> struct efivar_entry {
> - struct efivars *efivars;
> struct efi_variable var;
> struct list_head list;
> struct kobject kobj;
> @@ -137,8 +136,8 @@ struct efivar_attribute {
> ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
> };
>
> -static struct efivars __efivars;
> -static struct efivar_operations ops;
> +/* Private pointer to registered efivars */
> +static struct efivars *__efivars;
>
> #define PSTORE_EFI_ATTRIBUTES \
> (EFI_VARIABLE_NON_VOLATILE | \
> @@ -479,7 +478,7 @@ efivar_attr_read(struct efivar_entry *entry, char *buf)
> if (!entry || !buf)
> return -EINVAL;
>
> - status = get_var_data(entry->efivars, var);
> + status = get_var_data(__efivars, var);
> if (status != EFI_SUCCESS)
> return -EIO;
>
> @@ -513,7 +512,7 @@ efivar_size_read(struct efivar_entry *entry, char *buf)
> if (!entry || !buf)
> return -EINVAL;
>
> - status = get_var_data(entry->efivars, var);
> + status = get_var_data(__efivars, var);
> if (status != EFI_SUCCESS)
> return -EIO;
>
> @@ -530,7 +529,7 @@ efivar_data_read(struct efivar_entry *entry, char *buf)
> if (!entry || !buf)
> return -EINVAL;
>
> - status = get_var_data(entry->efivars, var);
> + status = get_var_data(__efivars, var);
> if (status != EFI_SUCCESS)
> return -EIO;
>
> @@ -545,7 +544,7 @@ static ssize_t
> efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
> {
> struct efi_variable *new_var, *var = &entry->var;
> - struct efivars *efivars = entry->efivars;
> + struct efivars *efivars = __efivars;
> efi_status_t status = EFI_NOT_FOUND;
>
> if (count != sizeof(struct efi_variable))
> @@ -606,7 +605,7 @@ efivar_show_raw(struct efivar_entry *entry, char *buf)
> if (!entry || !buf)
> return 0;
>
> - status = get_var_data(entry->efivars, var);
> + status = get_var_data(__efivars, var);
> if (status != EFI_SUCCESS)
> return -EIO;
>
> @@ -728,7 +727,7 @@ static ssize_t efivarfs_file_write(struct file *file,
> const char __user *userbuf, size_t count, loff_t *ppos)
> {
> struct efivar_entry *var = file->private_data;
> - struct efivars *efivars;
> + struct efivars *efivars = __efivars;
> efi_status_t status;
> void *data;
> u32 attributes;
> @@ -746,8 +745,6 @@ static ssize_t efivarfs_file_write(struct file *file,
> if (attributes & ~(EFI_VARIABLE_MASK))
> return -EINVAL;
>
> - efivars = var->efivars;
> -
> /*
> * Ensure that the user can't allocate arbitrarily large
> * amounts of memory. Pick a default size of 64K if
> @@ -855,7 +852,7 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
> size_t count, loff_t *ppos)
> {
> struct efivar_entry *var = file->private_data;
> - struct efivars *efivars = var->efivars;
> + struct efivars *efivars = __efivars;
> efi_status_t status;
> unsigned long datasize = 0;
> u32 attributes;
> @@ -1009,7 +1006,7 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
> umode_t mode, bool excl)
> {
> struct inode *inode;
> - struct efivars *efivars = &__efivars;
> + struct efivars *efivars = __efivars;
> struct efivar_entry *var;
> int namelen, i = 0, err = 0;
>
> @@ -1038,7 +1035,6 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
> var->var.VariableName[i] = '\0';
>
> inode->i_private = var;
> - var->efivars = efivars;
> var->kobj.kset = efivars->kset;
>
> err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s",
> @@ -1063,7 +1059,7 @@ out:
> static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
> {
> struct efivar_entry *var = dentry->d_inode->i_private;
> - struct efivars *efivars = var->efivars;
> + struct efivars *efivars = __efivars;
> efi_status_t status;
>
> spin_lock_irq(&efivars->lock);
> @@ -1175,7 +1171,7 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
> struct inode *inode = NULL;
> struct dentry *root;
> struct efivar_entry *entry, *n;
> - struct efivars *efivars = &__efivars;
> + struct efivars *efivars = __efivars;
> char *name;
> int err = -ENOMEM;
>
> @@ -1302,7 +1298,7 @@ static const struct inode_operations efivarfs_dir_inode_operations = {
>
> static int efi_pstore_open(struct pstore_info *psi)
> {
> - struct efivars *efivars = psi->data;
> + struct efivars *efivars = __efivars;
>
> spin_lock_irq(&efivars->lock);
> efivars->walk_entry = list_first_entry(&efivars->list,
> @@ -1312,7 +1308,7 @@ static int efi_pstore_open(struct pstore_info *psi)
>
> static int efi_pstore_close(struct pstore_info *psi)
> {
> - struct efivars *efivars = psi->data;
> + struct efivars *efivars = __efivars;
>
> spin_unlock_irq(&efivars->lock);
> return 0;
> @@ -1323,7 +1319,7 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
> char **buf, struct pstore_info *psi)
> {
> efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
> - struct efivars *efivars = psi->data;
> + struct efivars *efivars = __efivars;
> char name[DUMP_NAME_LEN];
> int i;
> int cnt;
> @@ -1386,7 +1382,7 @@ static int efi_pstore_write(enum pstore_type_id type,
> char name[DUMP_NAME_LEN];
> efi_char16_t efi_name[DUMP_NAME_LEN];
> efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
> - struct efivars *efivars = psi->data;
> + struct efivars *efivars = __efivars;
> int i, ret = 0;
> efi_status_t status = EFI_NOT_FOUND;
> unsigned long flags;
> @@ -1443,7 +1439,7 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
> char name_old[DUMP_NAME_LEN];
> efi_char16_t efi_name_old[DUMP_NAME_LEN];
> efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
> - struct efivars *efivars = psi->data;
> + struct efivars *efivars = __efivars;
> struct efivar_entry *entry, *found = NULL;
> int i;
>
> @@ -1535,7 +1531,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
> char *buf, loff_t pos, size_t count)
> {
> struct efi_variable *new_var = (struct efi_variable *)buf;
> - struct efivars *efivars = bin_attr->private;
> + struct efivars *efivars = __efivars;
> struct efivar_entry *search_efivar, *n;
> unsigned long strsize1, strsize2;
> efi_status_t status = EFI_NOT_FOUND;
> @@ -1612,7 +1608,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
> char *buf, loff_t pos, size_t count)
> {
> struct efi_variable *del_var = (struct efi_variable *)buf;
> - struct efivars *efivars = bin_attr->private;
> + struct efivars *efivars = __efivars;
> struct efivar_entry *search_efivar, *n;
> unsigned long strsize1, strsize2;
> efi_status_t status = EFI_NOT_FOUND;
> @@ -1670,7 +1666,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
> static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor)
> {
> struct efivar_entry *entry, *n;
> - struct efivars *efivars = &__efivars;
> + struct efivars *efivars = __efivars;
> unsigned long strsize1, strsize2;
> bool found = false;
>
> @@ -1716,7 +1712,7 @@ static unsigned long var_name_strnsize(efi_char16_t *variable_name,
>
> static void efivar_update_sysfs_entries(struct work_struct *work)
> {
> - struct efivars *efivars = &__efivars;
> + struct efivars *efivars = __efivars;
> efi_guid_t vendor;
> efi_char16_t *variable_name;
> unsigned long variable_name_size = 1024;
> @@ -1843,7 +1839,6 @@ efivar_create_sysfs_entry(struct efivars *efivars,
> return 1;
> }
>
> - new_efivar->efivars = efivars;
> memcpy(new_efivar->var.VariableName, variable_name,
> variable_name_size);
> memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t));
> @@ -1942,6 +1937,8 @@ void unregister_efivars(struct efivars *efivars)
> {
> struct efivar_entry *entry, *n;
>
> + __efivars = NULL;
> +
> list_for_each_entry_safe(entry, n, &efivars->list, list) {
> spin_lock_irq(&efivars->lock);
> list_del(&entry->list);
> @@ -1998,6 +1995,8 @@ int register_efivars(struct efivars *efivars,
> unsigned long variable_name_size = 1024;
> int error = 0;
>
> + __efivars = efivars;
> +
> variable_name = kzalloc(variable_name_size, GFP_KERNEL);
> if (!variable_name) {
> printk(KERN_ERR "efivars: Memory allocation failed.\n");
> @@ -2085,6 +2084,35 @@ out:
> }
> EXPORT_SYMBOL_GPL(register_efivars);
>
> +#ifdef CONFIG_EFI_VARS_GENERIC_OPS
> +static struct efivars generic_efivars;
> +static struct efivar_operations generic_ops;
> +
> +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_info = efi.query_variable_info;
> +
> + return register_efivars(&generic_efivars, &generic_ops, efi_kobj);
> +}
> +
> +void generic_ops_unregister(void)
> +{
> + unregister_efivars(&generic_efivars);
> +}
> +#else
> +static inline int generic_ops_register(void)
> +{
> + return 0;
> +}
> +
> +static inline void generic_ops_unregister(void)
> +{
> +}
> +#endif /* CONFIG_EFI_VARS_GENERIC_OPS */
> +
> /*
> * For now we register the efi subsystem with the firmware subsystem
> * and the vars subsystem with the efi subsystem. In the future, it
> @@ -2111,12 +2139,7 @@ efivars_init(void)
> return -ENOMEM;
> }
>
> - ops.get_variable = efi.get_variable;
> - ops.set_variable = efi.set_variable;
> - ops.get_next_variable = efi.get_next_variable;
> - ops.query_variable_info = efi.query_variable_info;
> -
> - error = register_efivars(&__efivars, &ops, efi_kobj);
> + error = generic_ops_register();
> if (error)
> goto err_put;
>
> @@ -2132,7 +2155,7 @@ efivars_init(void)
> return 0;
>
> err_unregister:
> - unregister_efivars(&__efivars);
> + generic_ops_unregister();
> err_put:
> kobject_put(efi_kobj);
> return error;
> @@ -2144,7 +2167,7 @@ efivars_exit(void)
> cancel_work_sync(&efivar_work);
>
> if (efi_enabled(EFI_RUNTIME_SERVICES)) {
> - unregister_efivars(&__efivars);
> + generic_ops_unregister();
> kobject_put(efi_kobj);
> }
> }
> --
> 1.7.10.4
>
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH 2/6] efivars: Keep a private global pointer to efivars
2013-04-09 22:07 ` Mike Waychison
@ 2013-04-11 13:10 ` Matt Fleming
0 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-11 13:10 UTC (permalink / raw)
To: Mike Waychison; +Cc: linux-efi, linux-kernel, Matt Fleming, Tom Gundersen
On 09/04/13 23:07, Mike Waychison wrote:
>> +config EFI_VARS_GENERIC_OPS
>> + bool
>> + depends on EFI
>> + depends on !GOOGLE_SMI
>> + default y
>> +
>
> So while we have no need to support both the gsmi and real efi
> entrypoints on any given machine, we still need to be able to support
> the operation of both from the same kernel build. How do you feel
> about removing this bit and leaving it such that efivars_init
> continues to register the "generic" efivars regardless of
> CONFIG_GOOGLE_SMI? The rest of the patch seems fine to me.
OK sure, we can do that. Thanks for the review.
--
Matt Fleming, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 3/6] efivars: efivar_entry API
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
2013-04-04 12:18 ` [PATCH 1/6] efi: move utf16 string functions to efi.h Matt Fleming
2013-04-04 12:18 ` [PATCH 2/6] efivars: Keep a private global pointer to efivars Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-10 15:25 ` Seiji Aguchi
2013-04-04 12:18 ` [PATCH 4/6] efivars: Move pstore code into the new EFI directory Matt Fleming
` (3 subsequent siblings)
6 siblings, 1 reply; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi
Cc: linux-kernel, Matt Fleming, Tom Gundersen, Seiji Aguchi,
Matthew Garrett, Jeremy Kerr, Tony Luck, Mike Waychison
From: Matt Fleming <matt.fleming@intel.com>
There isn't really a formal interface for dealing with EFI variables or struct
efivar_entry. Historically, this has led to various bits of code directly
accessing the generic EFI variable ops, which inherently ties it to a specific
EFI variable operations instead of indirectly using whatever ops were
registered with register_efivars(). This lead to the efivarfs code only working
with the generic EFI variable ops and not CONFIG_GOOGLE_SMI.
Encapsulate everything that needs to access '__efivars' inside an
efivar_entry_* API and use the new API in the pstore, sysfs and efivarfs code.
Much of the efivars code had to be rewritten to use this new API. For instance,
it is now up to the users of the API to build the initial list of EFI variables
in their efivar_init() callback function. The variable list needs to be passed
to efivar_init() which allows us to keep work arounds for things like
implementation bugs in GetNextVariable() in a central location.
Allowing users of the API to use a callback function to build the list greatly
benefits the efivarfs code which needs to allocate inodes and dentries for
every variable. It previously did this in a racy way because the code ran
without holding the variable spinlock. Both the sysfs and efivarfs code
maintain their own lists which means the two interfaces can be running
simultaneously without interference, though it should be noted that because no
synchronisation is performed it is very easy to create inconsistencies.
efibootmgr doesn't currently use efivarfs and users are likely to also require
the old sysfs interface, so it makes sense to allow both to be built.
Cc: Tom Gundersen <teg@jklm.no>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
drivers/firmware/efivars.c | 1789 ++++++++++++++++++++++++----------------
drivers/firmware/google/gsmi.c | 11 +-
include/linux/efi.h | 74 +-
3 files changed, 1143 insertions(+), 731 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 721d200..a0f5534 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -97,39 +97,14 @@ MODULE_VERSION(EFIVARS_VERSION);
#define DUMP_NAME_LEN 52
-/*
- * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
- * not including trailing NUL
- */
-#define GUID_LEN 36
+static LIST_HEAD(efivarfs_list);
+static LIST_HEAD(efivar_sysfs_list);
static bool efivars_pstore_disable =
IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
-/*
- * 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;
-};
-
struct efivar_attribute {
struct attribute attr;
ssize_t (*show) (struct efivar_entry *entry, char *buf);
@@ -144,6 +119,11 @@ static struct efivars *__efivars;
EFI_VARIABLE_BOOTSERVICE_ACCESS | \
EFI_VARIABLE_RUNTIME_ACCESS)
+static struct kset *efivars_kset;
+
+static struct bin_attribute *efivars_new_var;
+static struct bin_attribute *efivars_del_var;
+
#define EFIVAR_ATTR(_name, _mode, _show, _store) \
struct efivar_attribute efivar_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode}, \
@@ -158,10 +138,7 @@ struct efivar_attribute efivar_attr_##_name = { \
* Prototype for sysfs creation function
*/
static int
-efivar_create_sysfs_entry(struct efivars *efivars,
- unsigned long variable_name_size,
- efi_char16_t *variable_name,
- efi_guid_t *vendor_guid);
+efivar_create_sysfs_entry(struct efivar_entry *new_var);
/*
* Prototype for workqueue functions updating sysfs entry
@@ -346,8 +323,8 @@ static const struct variable_validate variable_validate[] = {
{ "", NULL },
};
-static bool
-validate_var(struct efi_variable *var, u8 *data, unsigned long len)
+bool
+efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
{
int i;
u16 *unicode_name = var->VariableName;
@@ -382,47 +359,16 @@ validate_var(struct efi_variable *var, u8 *data, unsigned long len)
return true;
}
+EXPORT_SYMBOL_GPL(efivar_validate);
static efi_status_t
-get_var_data_locked(struct efivars *efivars, struct efi_variable *var)
-{
- efi_status_t status;
-
- var->DataSize = 1024;
- status = efivars->ops->get_variable(var->VariableName,
- &var->VendorGuid,
- &var->Attributes,
- &var->DataSize,
- var->Data);
- return status;
-}
-
-static efi_status_t
-get_var_data(struct efivars *efivars, struct efi_variable *var)
-{
- efi_status_t status;
- unsigned long flags;
-
- spin_lock_irqsave(&efivars->lock, flags);
- status = get_var_data_locked(efivars, var);
- spin_unlock_irqrestore(&efivars->lock, flags);
-
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n",
- status);
- }
- return status;
-}
-
-static efi_status_t
-check_var_size_locked(struct efivars *efivars, u32 attributes,
- unsigned long size)
+check_var_size(u32 attributes, unsigned long size)
{
u64 storage_size, remaining_size, max_size;
efi_status_t status;
- const struct efivar_operations *fops = efivars->ops;
+ const struct efivar_operations *fops = __efivars->ops;
- if (!efivars->ops->query_variable_info)
+ if (!fops->query_variable_info)
return EFI_UNSUPPORTED;
status = fops->query_variable_info(attributes, &storage_size,
@@ -438,20 +384,6 @@ check_var_size_locked(struct efivars *efivars, u32 attributes,
return status;
}
-
-static efi_status_t
-check_var_size(struct efivars *efivars, u32 attributes, unsigned long size)
-{
- efi_status_t status;
- unsigned long flags;
-
- spin_lock_irqsave(&efivars->lock, flags);
- status = check_var_size_locked(efivars, attributes, size);
- spin_unlock_irqrestore(&efivars->lock, flags);
-
- return status;
-}
-
static ssize_t
efivar_guid_read(struct efivar_entry *entry, char *buf)
{
@@ -473,13 +405,12 @@ efivar_attr_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
char *str = buf;
- efi_status_t status;
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(__efivars, var);
- if (status != EFI_SUCCESS)
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
return -EIO;
if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
@@ -507,13 +438,12 @@ efivar_size_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
char *str = buf;
- efi_status_t status;
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(__efivars, var);
- if (status != EFI_SUCCESS)
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
return -EIO;
str += sprintf(str, "0x%lx\n", var->DataSize);
@@ -524,13 +454,12 @@ static ssize_t
efivar_data_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
- efi_status_t status;
if (!entry || !buf)
return -EINVAL;
- status = get_var_data(__efivars, var);
- if (status != EFI_SUCCESS)
+ var->DataSize = 1024;
+ if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
return -EIO;
memcpy(buf, var->Data, var->DataSize);
@@ -544,8 +473,7 @@ static ssize_t
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
{
struct efi_variable *new_var, *var = &entry->var;
- struct efivars *efivars = __efivars;
- efi_status_t status = EFI_NOT_FOUND;
+ int err;
if (count != sizeof(struct efi_variable))
return -EINVAL;
@@ -567,32 +495,20 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
}
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
- validate_var(new_var, new_var->Data, new_var->DataSize) == false) {
+ efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
- spin_lock_irq(&efivars->lock);
-
- status = check_var_size_locked(efivars, new_var->Attributes,
- new_var->DataSize + utf16_strsize(new_var->VariableName, 1024));
-
- if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED)
- status = efivars->ops->set_variable(new_var->VariableName,
- &new_var->VendorGuid,
- new_var->Attributes,
- new_var->DataSize,
- new_var->Data);
-
- spin_unlock_irq(&efivars->lock);
+ memcpy(&entry->var, new_var, count);
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
- status);
+ 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;
}
- memcpy(&entry->var, new_var, count);
return count;
}
@@ -600,16 +516,17 @@ static ssize_t
efivar_show_raw(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
- efi_status_t status;
if (!entry || !buf)
return 0;
- status = get_var_data(__efivars, var);
- if (status != EFI_SUCCESS)
+ 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);
}
@@ -698,6 +615,9 @@ 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;
@@ -714,7 +634,7 @@ static int efi_status_to_err(efi_status_t status)
err = -EACCES;
break;
case EFI_NOT_FOUND:
- err = -EIO;
+ err = -ENOENT;
break;
default:
err = -EINVAL;
@@ -727,14 +647,12 @@ static ssize_t efivarfs_file_write(struct file *file,
const char __user *userbuf, size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
- struct efivars *efivars = __efivars;
- efi_status_t status;
void *data;
u32 attributes;
struct inode *inode = file->f_mapping->host;
unsigned long datasize = count - sizeof(attributes);
- unsigned long newdatasize, varsize;
ssize_t bytes = 0;
+ bool set = false;
if (count < sizeof(attributes))
return -EINVAL;
@@ -745,23 +663,6 @@ static ssize_t efivarfs_file_write(struct file *file,
if (attributes & ~(EFI_VARIABLE_MASK))
return -EINVAL;
- /*
- * Ensure that the user can't allocate arbitrarily large
- * amounts of memory. Pick a default size of 64K if
- * QueryVariableInfo() isn't supported by the firmware.
- */
-
- varsize = datasize + utf16_strsize(var->var.VariableName, 1024);
- status = check_var_size(efivars, attributes, varsize);
-
- if (status != EFI_SUCCESS) {
- if (status != EFI_UNSUPPORTED)
- return efi_status_to_err(status);
-
- if (datasize > 65536)
- return -ENOSPC;
- }
-
data = kmalloc(datasize, GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -771,76 +672,24 @@ static ssize_t efivarfs_file_write(struct file *file,
goto out;
}
- if (validate_var(&var->var, data, datasize) == false) {
- bytes = -EINVAL;
+ bytes = efivar_entry_set_get_size(var, attributes, &datasize,
+ data, &set);
+ if (!set && bytes)
goto out;
- }
-
- /*
- * 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_locked(efivars, attributes, varsize);
-
- if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) {
- spin_unlock_irq(&efivars->lock);
- kfree(data);
-
- return efi_status_to_err(status);
- }
-
- status = efivars->ops->set_variable(var->var.VariableName,
- &var->var.VendorGuid,
- attributes, datasize,
- data);
-
- if (status != EFI_SUCCESS) {
- spin_unlock_irq(&efivars->lock);
- kfree(data);
-
- return efi_status_to_err(status);
- }
-
- bytes = count;
- /*
- * 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.
- */
- newdatasize = 0;
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- NULL, &newdatasize,
- NULL);
-
- if (status == EFI_BUFFER_TOO_SMALL) {
- spin_unlock_irq(&efivars->lock);
+ if (!bytes) {
mutex_lock(&inode->i_mutex);
- i_size_write(inode, newdatasize + sizeof(attributes));
+ i_size_write(inode, datasize + sizeof(attributes));
mutex_unlock(&inode->i_mutex);
-
- } else if (status == EFI_NOT_FOUND) {
- list_del(&var->list);
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(var);
+ } else if (bytes == -ENOENT) {
drop_nlink(inode);
d_delete(file->f_dentry);
dput(file->f_dentry);
-
- } else {
- spin_unlock_irq(&efivars->lock);
+ } else
pr_warn("efivarfs: inconsistent EFI variable implementation? "
- "status = %lx\n", status);
- }
+ "status=%zu\n", bytes);
+
+ bytes = count;
out:
kfree(data);
@@ -852,38 +701,25 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
- struct efivars *efivars = __efivars;
- efi_status_t status;
unsigned long datasize = 0;
u32 attributes;
void *data;
ssize_t size = 0;
+ int err;
- spin_lock_irq(&efivars->lock);
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- &attributes, &datasize, NULL);
- spin_unlock_irq(&efivars->lock);
-
- if (status != EFI_BUFFER_TOO_SMALL)
- return efi_status_to_err(status);
+ err = efivar_entry_size(var, &datasize);
+ if (err)
+ return err;
data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
if (!data)
return -ENOMEM;
- spin_lock_irq(&efivars->lock);
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- &attributes, &datasize,
- (data + sizeof(attributes)));
- spin_unlock_irq(&efivars->lock);
-
- if (status != EFI_SUCCESS) {
- size = efi_status_to_err(status);
+ size = efivar_entry_get(var, &attributes, &datasize,
+ data + sizeof(attributes));
+ if (size)
goto out_free;
- }
memcpy(data, &attributes, sizeof(attributes));
size = simple_read_from_buffer(userbuf, count, ppos,
@@ -947,17 +783,17 @@ static struct inode *efivarfs_get_inode(struct super_block *sb,
*/
static bool efivarfs_valid_name(const char *str, int len)
{
- static const char dashes[GUID_LEN] = {
+ static const char dashes[EFI_VARIABLE_GUID_LEN] = {
[8] = 1, [13] = 1, [18] = 1, [23] = 1
};
- const char *s = str + len - GUID_LEN;
+ const char *s = str + len - EFI_VARIABLE_GUID_LEN;
int i;
/*
* We need a GUID, plus at least one letter for the variable name,
* plus the '-' separator
*/
- if (len < GUID_LEN + 2)
+ if (len < EFI_VARIABLE_GUID_LEN + 2)
return false;
/* GUID must be preceded by a '-' */
@@ -969,7 +805,7 @@ static bool efivarfs_valid_name(const char *str, int len)
*
* 12345678-1234-1234-1234-123456789abc
*/
- for (i = 0; i < GUID_LEN; i++) {
+ for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) {
if (dashes[i]) {
if (*s++ != '-')
return false;
@@ -1006,7 +842,6 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
struct inode *inode;
- struct efivars *efivars = __efivars;
struct efivar_entry *var;
int namelen, i = 0, err = 0;
@@ -1024,7 +859,7 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
}
/* length of the variable name itself: remove GUID and separator */
- namelen = dentry->d_name.len - GUID_LEN - 1;
+ namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1;
efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
&var->var.VendorGuid);
@@ -1035,17 +870,8 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
var->var.VariableName[i] = '\0';
inode->i_private = var;
- var->kobj.kset = efivars->kset;
-
- err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s",
- dentry->d_name.name);
- if (err)
- goto out;
- kobject_uevent(&var->kobj, KOBJ_ADD);
- spin_lock_irq(&efivars->lock);
- list_add(&var->list, &efivars->list);
- spin_unlock_irq(&efivars->lock);
+ efivar_entry_add(var, &efivarfs_list);
d_instantiate(dentry, inode);
dget(dentry);
out:
@@ -1059,26 +885,13 @@ out:
static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct efivar_entry *var = dentry->d_inode->i_private;
- struct efivars *efivars = __efivars;
- efi_status_t status;
-
- spin_lock_irq(&efivars->lock);
- status = efivars->ops->set_variable(var->var.VariableName,
- &var->var.VendorGuid,
- 0, 0, NULL);
-
- if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) {
- list_del(&var->list);
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(var);
- drop_nlink(dentry->d_inode);
- dput(dentry);
- return 0;
- }
+ if (efivar_entry_delete(var))
+ return -EINVAL;
- spin_unlock_irq(&efivars->lock);
- return -EINVAL;
+ drop_nlink(dentry->d_inode);
+ dput(dentry);
+ return 0;
};
/*
@@ -1097,7 +910,7 @@ static int efivarfs_d_compare(const struct dentry *parent, const struct inode *p
unsigned int len, const char *str,
const struct qstr *name)
{
- int guid = len - GUID_LEN;
+ int guid = len - EFI_VARIABLE_GUID_LEN;
if (name->len != len)
return 1;
@@ -1107,7 +920,7 @@ static int efivarfs_d_compare(const struct dentry *parent, const struct inode *p
return 1;
/* Case-insensitive compare for the GUID */
- return strncasecmp(name->name + guid, str + guid, GUID_LEN);
+ return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);
}
static int efivarfs_d_hash(const struct dentry *dentry,
@@ -1120,7 +933,7 @@ static int efivarfs_d_hash(const struct dentry *dentry,
if (!efivarfs_valid_name(s, len))
return -EINVAL;
- while (len-- > GUID_LEN)
+ while (len-- > EFI_VARIABLE_GUID_LEN)
hash = partial_name_hash(*s++, hash);
/* GUID is case-insensitive. */
@@ -1166,15 +979,87 @@ static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
return ERR_PTR(-ENOMEM);
}
-static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
+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 *root;
- struct efivar_entry *entry, *n;
- struct efivars *efivars = __efivars;
+ 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 = utf16_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;
@@ -1195,65 +1080,12 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
if (!root)
return -ENOMEM;
- list_for_each_entry_safe(entry, n, &efivars->list, list) {
- struct dentry *dentry, *root = efivarfs_sb->s_root;
- unsigned long size = 0;
- int len, i;
-
- inode = NULL;
-
- len = utf16_strlen(entry->var.VariableName);
-
- /* name, plus '-', plus GUID, plus NUL*/
- name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC);
- 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+GUID_LEN+1] = '\0';
-
- inode = efivarfs_get_inode(efivarfs_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);
-
- spin_lock_irq(&efivars->lock);
- efivars->ops->get_variable(entry->var.VariableName,
- &entry->var.VendorGuid,
- &entry->var.Attributes,
- &size,
- NULL);
- spin_unlock_irq(&efivars->lock);
-
- 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);
- }
+ INIT_LIST_HEAD(&efivarfs_list);
- return 0;
+ err = efivar_init(efivarfs_callback, (void *)sb, false, &efivarfs_list);
+ if (err)
+ __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
-fail_inode:
- iput(inode);
-fail_name:
- kfree(name);
-fail:
return err;
}
@@ -1267,6 +1099,9 @@ 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 = {
@@ -1298,80 +1133,84 @@ static const struct inode_operations efivarfs_dir_inode_operations = {
static int efi_pstore_open(struct pstore_info *psi)
{
- struct efivars *efivars = __efivars;
-
- spin_lock_irq(&efivars->lock);
- efivars->walk_entry = list_first_entry(&efivars->list,
- struct efivar_entry, list);
+ efivar_entry_iter_begin();
+ psi->data = NULL;
return 0;
}
static int efi_pstore_close(struct pstore_info *psi)
{
- struct efivars *efivars = __efivars;
-
- spin_unlock_irq(&efivars->lock);
+ efivar_entry_iter_end();
+ psi->data = NULL;
return 0;
}
-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 {
+ 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 efivars *efivars = __efivars;
+ struct pstore_read_data *cb_data = data;
char name[DUMP_NAME_LEN];
int i;
int cnt;
- unsigned int part, size;
- unsigned long time;
-
- while (&efivars->walk_entry->list != &efivars->list) {
- if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid,
- vendor)) {
- for (i = 0; i < DUMP_NAME_LEN; i++) {
- name[i] = efivars->walk_entry->var.VariableName[i];
- }
- if (sscanf(name, "dump-type%u-%u-%d-%lu",
- type, &part, &cnt, &time) == 4) {
- *id = part;
- *count = cnt;
- timespec->tv_sec = time;
- timespec->tv_nsec = 0;
- } else if (sscanf(name, "dump-type%u-%u-%lu",
- type, &part, &time) == 3) {
- /*
- * Check if an old format,
- * which doesn't support holding
- * multiple logs, remains.
- */
- *id = part;
- *count = 0;
- timespec->tv_sec = time;
- timespec->tv_nsec = 0;
- } else {
- efivars->walk_entry = list_entry(
- efivars->walk_entry->list.next,
- struct efivar_entry, list);
- continue;
- }
+ unsigned int part;
+ unsigned long time, size;
- get_var_data_locked(efivars, &efivars->walk_entry->var);
- size = efivars->walk_entry->var.DataSize;
- *buf = kmalloc(size, GFP_KERNEL);
- if (*buf == NULL)
- return -ENOMEM;
- memcpy(*buf, efivars->walk_entry->var.Data,
- size);
- efivars->walk_entry = list_entry(
- efivars->walk_entry->list.next,
- struct efivar_entry, list);
- return size;
- }
- efivars->walk_entry = list_entry(efivars->walk_entry->list.next,
- struct efivar_entry, list);
- }
- return 0;
+ 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,
@@ -1382,36 +1221,7 @@ static int efi_pstore_write(enum pstore_type_id type,
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- struct efivars *efivars = __efivars;
int i, ret = 0;
- efi_status_t status = EFI_NOT_FOUND;
- unsigned long flags;
-
- if (pstore_cannot_block_path(reason)) {
- /*
- * If the lock is taken by another cpu in non-blocking path,
- * this driver returns without entering firmware to avoid
- * hanging up.
- */
- if (!spin_trylock_irqsave(&efivars->lock, flags))
- return -EBUSY;
- } else
- spin_lock_irqsave(&efivars->lock, flags);
-
- /*
- * Check if there is a space enough to log.
- * size: a size of logging data
- * DUMP_NAME_LEN * 2: a maximum size of variable name
- */
-
- status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES,
- size + DUMP_NAME_LEN * 2);
-
- if (status) {
- spin_unlock_irqrestore(&efivars->lock, flags);
- *id = part;
- return -ENOSPC;
- }
sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
get_seconds());
@@ -1419,81 +1229,90 @@ static int efi_pstore_write(enum pstore_type_id type,
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
- efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,
- size, psi->buf);
+ ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
+ !pstore_cannot_block_path(reason),
+ size, psi->buf);
- spin_unlock_irqrestore(&efivars->lock, flags);
-
- if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
+ if (size && !ret && reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
schedule_work(&efivar_work);
*id = part;
return ret;
};
-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 {
+ 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)
{
- char name[DUMP_NAME_LEN];
- efi_char16_t efi_name[DUMP_NAME_LEN];
- char name_old[DUMP_NAME_LEN];
- efi_char16_t efi_name_old[DUMP_NAME_LEN];
+ struct pstore_erase_data *ed = data;
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- struct efivars *efivars = __efivars;
- struct efivar_entry *entry, *found = NULL;
+ efi_char16_t efi_name_old[DUMP_NAME_LEN];
+ efi_char16_t *efi_name = ed->name;
+ unsigned long utf16_len = utf16_strlen(ed->name);
+ char name_old[DUMP_NAME_LEN];
int i;
- sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
- time.tv_sec);
+ if (efi_guidcmp(entry->var.VendorGuid, vendor))
+ return 0;
- spin_lock_irq(&efivars->lock);
+ if (utf16_strncmp(entry->var.VariableName,
+ efi_name, (size_t)utf16_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[i] = name[i];
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name_old[i] = name_old[i];
- /*
- * Clean up an entry with the same name
- */
+ if (utf16_strncmp(entry->var.VariableName, efi_name_old,
+ utf16_strlen(efi_name_old)))
+ return 0;
+ }
- list_for_each_entry(entry, &efivars->list, list) {
- get_var_data_locked(efivars, &entry->var);
-
- if (efi_guidcmp(entry->var.VendorGuid, vendor))
- continue;
- if (utf16_strncmp(entry->var.VariableName, efi_name,
- utf16_strlen(efi_name))) {
- /*
- * Check if an old format,
- * which doesn't support holding
- * multiple logs, remains.
- */
- sprintf(name_old, "dump-type%u-%u-%lu", type,
- (unsigned int)id, time.tv_sec);
+ /* found */
+ __efivar_entry_delete(entry);
+ return 1;
+}
- for (i = 0; i < DUMP_NAME_LEN; i++)
- efi_name_old[i] = name_old[i];
+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;
- if (utf16_strncmp(entry->var.VariableName, efi_name_old,
- utf16_strlen(efi_name_old)))
- continue;
- }
+ sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
+ time.tv_sec);
- /* found */
- found = entry;
- efivars->ops->set_variable(entry->var.VariableName,
- &entry->var.VendorGuid,
- PSTORE_EFI_ATTRIBUTES,
- 0, NULL);
- break;
- }
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name[i] = name[i];
- if (found)
- list_del(&found->list);
+ edata.id = id;
+ edata.type = type;
+ edata.count = count;
+ edata.time = time;
+ edata.name = efi_name;
- spin_unlock_irq(&efivars->lock);
+ 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(found);
+ efivar_unregister(entry);
return 0;
}
@@ -1508,19 +1327,17 @@ static struct pstore_info efi_pstore_info = {
.erase = efi_pstore_erase,
};
-static void efivar_pstore_register(struct efivars *efivars)
+static void efivar_pstore_register(void)
{
- efivars->efi_pstore_info = efi_pstore_info;
- efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
- if (efivars->efi_pstore_info.buf) {
- efivars->efi_pstore_info.bufsize = 1024;
- efivars->efi_pstore_info.data = efivars;
- spin_lock_init(&efivars->efi_pstore_info.buf_lock);
- pstore_register(&efivars->efi_pstore_info);
+ efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
+ if (efi_pstore_info.buf) {
+ efi_pstore_info.bufsize = 1024;
+ spin_lock_init(&efi_pstore_info.buf_lock);
+ pstore_register(&efi_pstore_info);
}
}
#else
-static void efivar_pstore_register(struct efivars *efivars)
+static void efivar_pstore_register(void)
{
return;
}
@@ -1531,76 +1348,41 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
char *buf, loff_t pos, size_t count)
{
struct efi_variable *new_var = (struct efi_variable *)buf;
- struct efivars *efivars = __efivars;
- struct efivar_entry *search_efivar, *n;
- unsigned long strsize1, strsize2;
- efi_status_t status = EFI_NOT_FOUND;
- int found = 0;
+ struct efivar_entry *new_entry;
+ int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
- validate_var(new_var, new_var->Data, new_var->DataSize) == false) {
+ efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
- spin_lock_irq(&efivars->lock);
-
- /*
- * Does this variable already exist?
- */
- list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
- strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
- strsize2 = utf16_strsize(new_var->VariableName, 1024);
- if (strsize1 == strsize2 &&
- !memcmp(&(search_efivar->var.VariableName),
- new_var->VariableName, strsize1) &&
- !efi_guidcmp(search_efivar->var.VendorGuid,
- new_var->VendorGuid)) {
- found = 1;
- break;
- }
- }
- if (found) {
- spin_unlock_irq(&efivars->lock);
- return -EINVAL;
- }
+ new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
+ if (!new_entry)
+ return -ENOMEM;
- status = check_var_size_locked(efivars, new_var->Attributes,
- new_var->DataSize + utf16_strsize(new_var->VariableName, 1024));
+ memcpy(&new_entry->var, new_var, sizeof(*new_var));
- if (status && status != EFI_UNSUPPORTED) {
- spin_unlock_irq(&efivars->lock);
- return efi_status_to_err(status);
+ 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;
}
- /* now *really* create the variable via EFI */
- status = efivars->ops->set_variable(new_var->VariableName,
- &new_var->VendorGuid,
- new_var->Attributes,
- new_var->DataSize,
- new_var->Data);
-
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
- status);
- spin_unlock_irq(&efivars->lock);
- return -EIO;
- }
- spin_unlock_irq(&efivars->lock);
-
- /* Create the entry in sysfs. Locking is not required here */
- status = efivar_create_sysfs_entry(efivars,
- utf16_strsize(new_var->VariableName,
- 1024),
- new_var->VariableName,
- &new_var->VendorGuid);
- if (status) {
- printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n");
+ 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,
@@ -1608,70 +1390,40 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
char *buf, loff_t pos, size_t count)
{
struct efi_variable *del_var = (struct efi_variable *)buf;
- struct efivars *efivars = __efivars;
- struct efivar_entry *search_efivar, *n;
- unsigned long strsize1, strsize2;
- efi_status_t status = EFI_NOT_FOUND;
- int found = 0;
+ struct efivar_entry *entry;
+ int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- spin_lock_irq(&efivars->lock);
+ 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;
- /*
- * Does this variable already exist?
- */
- list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
- strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
- strsize2 = utf16_strsize(del_var->VariableName, 1024);
- if (strsize1 == strsize2 &&
- !memcmp(&(search_efivar->var.VariableName),
- del_var->VariableName, strsize1) &&
- !efi_guidcmp(search_efivar->var.VendorGuid,
- del_var->VendorGuid)) {
- found = 1;
- break;
- }
- }
- if (!found) {
- spin_unlock_irq(&efivars->lock);
- return -EINVAL;
- }
- /* force the Attributes/DataSize to 0 to ensure deletion */
- del_var->Attributes = 0;
- del_var->DataSize = 0;
+ efivar_entry_iter_end();
- status = efivars->ops->set_variable(del_var->VariableName,
- &del_var->VendorGuid,
- del_var->Attributes,
- del_var->DataSize,
- del_var->Data);
+ if (err)
+ return err;
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
- status);
- spin_unlock_irq(&efivars->lock);
- return -EIO;
- }
- list_del(&search_efivar->list);
- /* We need to release this lock before unregistering. */
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(search_efivar);
+ efivar_unregister(entry);
/* It's dead Jim.... */
return count;
}
-static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor)
+static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor,
+ struct list_head *head)
{
struct efivar_entry *entry, *n;
- struct efivars *efivars = __efivars;
unsigned long strsize1, strsize2;
bool found = false;
strsize1 = utf16_strsize(variable_name, 1024);
- list_for_each_entry_safe(entry, n, &efivars->list, list) {
+ list_for_each_entry_safe(entry, n, head, list) {
strsize2 = utf16_strsize(entry->var.VariableName, 1024);
if (strsize1 == strsize2 &&
!memcmp(variable_name, &(entry->var.VariableName),
@@ -1685,6 +1437,20 @@ static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor)
return found;
}
+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;
+}
+
/*
* Returns the size of variable_name, in bytes, including the
* terminating NULL character, or variable_name_size if no NULL
@@ -1712,52 +1478,25 @@ static unsigned long var_name_strnsize(efi_char16_t *variable_name,
static void efivar_update_sysfs_entries(struct work_struct *work)
{
- struct efivars *efivars = __efivars;
- efi_guid_t vendor;
- efi_char16_t *variable_name;
- unsigned long variable_name_size = 1024;
- efi_status_t status = EFI_NOT_FOUND;
- bool found;
+ struct efivar_entry *entry;
+ int err;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return;
/* Add new sysfs entries */
while (1) {
- variable_name = kzalloc(variable_name_size, GFP_KERNEL);
- if (!variable_name) {
- pr_err("efivars: Memory allocation failed.\n");
- return;
- }
+ memset(entry, 0, sizeof(*entry));
- spin_lock_irq(&efivars->lock);
- found = false;
- while (1) {
- variable_name_size = 1024;
- status = efivars->ops->get_next_variable(
- &variable_name_size,
- variable_name,
- &vendor);
- if (status != EFI_SUCCESS) {
- break;
- } else {
- if (!variable_is_present(variable_name,
- &vendor)) {
- found = true;
- break;
- }
- }
- }
- spin_unlock_irq(&efivars->lock);
-
- if (!found) {
- kfree(variable_name);
+ err = efivar_init(efivar_update_sysfs_entry, entry, true, &efivar_sysfs_list);
+ if (!err)
break;
- } else {
- variable_name_size = var_name_strnsize(variable_name,
- variable_name_size);
- efivar_create_sysfs_entry(efivars,
- variable_name_size,
- variable_name, &vendor);
- }
+
+ efivar_create_sysfs_entry(entry);
}
+
+ kfree(entry);
}
/*
@@ -1804,45 +1543,37 @@ static struct attribute_group efi_subsys_attr_group = {
static struct kobject *efi_kobj;
-/*
- * efivar_create_sysfs_entry()
- * Requires:
- * variable_name_size = number of bytes required to hold
- * variable_name (not counting the NULL
- * character at the end.
- * efivars->lock is not held on entry or exit.
+/**
+ * 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 efivars *efivars,
- unsigned long variable_name_size,
- efi_char16_t *variable_name,
- efi_guid_t *vendor_guid)
+efivar_create_sysfs_entry(struct efivar_entry *new_var)
{
int i, short_name_size;
char *short_name;
- struct efivar_entry *new_efivar;
+ unsigned long variable_name_size;
+ efi_char16_t *variable_name;
+
+ variable_name = new_var->var.VariableName;
+ variable_name_size = utf16_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 + GUID_LEN + 1;
+ + 1 + EFI_VARIABLE_GUID_LEN + 1;
short_name = kzalloc(short_name_size, GFP_KERNEL);
- new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
- if (!short_name || !new_efivar) {
+ if (!short_name) {
kfree(short_name);
- kfree(new_efivar);
return 1;
}
- memcpy(new_efivar->var.VariableName, variable_name,
- variable_name_size);
- memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t));
-
/* 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++) {
@@ -1852,30 +1583,25 @@ efivar_create_sysfs_entry(struct efivars *efivars,
private variables from another's. */
*(short_name + strlen(short_name)) = '-';
- efi_guid_unparse(vendor_guid, short_name + strlen(short_name));
+ efi_guid_unparse(&new_var->var.VendorGuid,
+ short_name + strlen(short_name));
- new_efivar->kobj.kset = efivars->kset;
- i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL,
- "%s", short_name);
- if (i) {
- kfree(short_name);
- kfree(new_efivar);
- return 1;
- }
+ new_var->kobj.kset = efivars_kset;
- kobject_uevent(&new_efivar->kobj, KOBJ_ADD);
+ i = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
+ NULL, "%s", short_name);
kfree(short_name);
- short_name = NULL;
+ if (i)
+ return 1;
- spin_lock_irq(&efivars->lock);
- list_add(&new_efivar->list, &efivars->list);
- spin_unlock_irq(&efivars->lock);
+ kobject_uevent(&new_var->kobj, KOBJ_ADD);
+ efivar_entry_add(new_var, &efivar_sysfs_list);
return 0;
}
static int
-create_efivars_bin_attributes(struct efivars *efivars)
+create_efivars_bin_attributes(void)
{
struct bin_attribute *attr;
int error;
@@ -1888,8 +1614,7 @@ create_efivars_bin_attributes(struct efivars *efivars)
attr->attr.name = "new_var";
attr->attr.mode = 0200;
attr->write = efivar_create;
- attr->private = efivars;
- efivars->new_var = attr;
+ efivars_new_var = attr;
/* del_var */
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
@@ -1900,61 +1625,59 @@ create_efivars_bin_attributes(struct efivars *efivars)
attr->attr.name = "del_var";
attr->attr.mode = 0200;
attr->write = efivar_delete;
- attr->private = efivars;
- efivars->del_var = attr;
+ efivars_del_var = attr;
- sysfs_bin_attr_init(efivars->new_var);
- sysfs_bin_attr_init(efivars->del_var);
+ 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);
+ 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);
+
+ 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);
+ 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;
+ kfree(efivars_del_var);
+ efivars_del_var = NULL;
+ kfree(efivars_new_var);
+ efivars_new_var = NULL;
return error;
}
-void unregister_efivars(struct efivars *efivars)
+static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
+ unsigned long name_size, void *data)
{
- struct efivar_entry *entry, *n;
+ struct efivar_entry *entry;
- __efivars = NULL;
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
- list_for_each_entry_safe(entry, n, &efivars->list, list) {
- spin_lock_irq(&efivars->lock);
- list_del(&entry->list);
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(entry);
- }
- 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);
- kobject_put(efivars->kobject);
- kset_unregister(efivars->kset);
+ 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;
}
-EXPORT_SYMBOL_GPL(unregister_efivars);
/*
* Print a warning when duplicate EFI variables are encountered and
@@ -1985,43 +1708,88 @@ static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid,
kfree(s8);
}
-int register_efivars(struct efivars *efivars,
- const struct efivar_operations *ops,
- struct kobject *parent_kobj)
+static struct kobject *efivars_kobj;
+
+void efivars_sysfs_exit(void)
{
- efi_status_t status = EFI_NOT_FOUND;
- efi_guid_t vendor_guid;
- efi_char16_t *variable_name;
- unsigned long variable_name_size = 1024;
- int error = 0;
+ /* Remove all entries and destroy */
+ __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL);
- __efivars = efivars;
+ 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);
+ kobject_put(efivars_kobj);
+ kset_unregister(efivars_kset);
+}
- variable_name = kzalloc(variable_name_size, GFP_KERNEL);
- if (!variable_name) {
- printk(KERN_ERR "efivars: Memory allocation failed.\n");
- return -ENOMEM;
- }
+int efivars_sysfs_init(void)
+{
+ struct kobject *parent_kobj = efivars_kobject();
+ int error = 0;
- spin_lock_init(&efivars->lock);
- INIT_LIST_HEAD(&efivars->list);
- efivars->ops = ops;
+ /* No efivars has been registered yet */
+ if (!parent_kobj)
+ return 0;
- efivars->kset = kset_create_and_add("vars", NULL, parent_kobj);
- if (!efivars->kset) {
+ 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");
- error = -ENOMEM;
- goto out;
+ return -ENOMEM;
}
- efivars->kobject = kobject_create_and_add("efivars", parent_kobj);
- if (!efivars->kobject) {
+ efivars_kobj = kobject_create_and_add("efivars", parent_kobj);
+ if (!efivars_kobj) {
pr_err("efivars: Subsystem registration failed.\n");
- error = -ENOMEM;
- kset_unregister(efivars->kset);
- goto out;
+ kset_unregister(efivars_kset);
+ return -ENOMEM;
}
+ efivar_init(efivars_sysfs_callback, NULL, false, &efivar_sysfs_list);
+
+ error = create_efivars_bin_attributes();
+ if (error)
+ efivars_sysfs_exit();
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(efivars_sysfs_init);
+
+/**
+ * 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?
+ * @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, 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.
@@ -2035,6 +1803,9 @@ int register_efivars(struct efivars *efivars,
&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);
@@ -2046,17 +1817,23 @@ int register_efivars(struct efivars *efivars,
* we'll ever see a different variable name,
* and may end up looping here forever.
*/
- if (variable_is_present(variable_name, &vendor_guid)) {
+ if (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;
}
- efivar_create_sysfs_entry(efivars,
- variable_name_size,
- variable_name,
- &vendor_guid);
+ 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;
@@ -2066,23 +1843,583 @@ int register_efivars(struct efivars *efivars,
status = EFI_NOT_FOUND;
break;
}
+
} while (status != EFI_NOT_FOUND);
- error = create_efivars_bin_attributes(efivars);
- if (error)
- unregister_efivars(efivars);
+ 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 and remove @entry from the
+ * variable list. It is the caller's responsibility to free @entry
+ * once we return.
+ *
+ * This function differs from efivar_entry_delete() because 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. If set_variable() fails the entry remains
+ * on the list.
+ */
+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);
+ if (status)
+ return efi_status_to_err(status);
+
+ list_del(&entry->list);
+
+ return 0;
+}
+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;
+ }
+
+ status = check_var_size(attributes, size + utf16_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;
+
+ if (!ops->query_variable_info)
+ return -ENOSYS;
+
+ if (!block && !spin_trylock_irqsave(&__efivars->lock, flags))
+ return -EBUSY;
+ else
+ spin_lock_irqsave(&__efivars->lock, flags);
+
+ status = check_var_size(attributes, size + utf16_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) {
+ strsize1 = utf16_strsize(name, 1024);
+ strsize2 = utf16_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
+ */
+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 + utf16_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);
+
+/**
+ * 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;
if (!efivars_pstore_disable)
- efivar_pstore_register(efivars);
+ efivar_pstore_register();
register_filesystem(&efivarfs_type);
-out:
- kfree(variable_name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(efivars_register);
- return error;
+/**
+ * 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(register_efivars);
+EXPORT_SYMBOL_GPL(efivars_unregister);
#ifdef CONFIG_EFI_VARS_GENERIC_OPS
static struct efivars generic_efivars;
@@ -2090,17 +2427,28 @@ static struct efivar_operations generic_ops;
int generic_ops_register(void)
{
+ int error;
+
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_info = efi.query_variable_info;
- return register_efivars(&generic_efivars, &generic_ops, efi_kobj);
+ error = efivars_register(&generic_efivars, &generic_ops, efi_kobj);
+ if (error)
+ return error;
+
+ error = efivars_sysfs_init();
+ if (error)
+ efivars_unregister(&generic_efivars);
+
+ return error;
}
void generic_ops_unregister(void)
{
- unregister_efivars(&generic_efivars);
+ efivars_sysfs_exit();
+ efivars_unregister(&generic_efivars);
}
#else
static inline int generic_ops_register(void)
@@ -2124,15 +2472,12 @@ static inline void generic_ops_unregister(void)
static int __init
efivars_init(void)
{
- int error = 0;
-
- printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
- EFIVARS_DATE);
+ int error;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return 0;
- /* For now we'll register the efi directory at /sys/firmware/efi */
+ /* Register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
if (!efi_kobj) {
printk(KERN_ERR "efivars: Firmware registration failed.\n");
diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
index c409a75..757b2d9 100644
--- a/drivers/firmware/google/gsmi.c
+++ b/drivers/firmware/google/gsmi.c
@@ -882,12 +882,19 @@ static __init int gsmi_init(void)
goto out_remove_bin_file;
}
- ret = register_efivars(&efivars, &efivar_ops, gsmi_kobj);
+ ret = efivars_register(&efivars, &efivar_ops, gsmi_kobj);
if (ret) {
printk(KERN_INFO "gsmi: Failed to register efivars\n");
goto out_remove_sysfs_files;
}
+ ret = efivars_sysfs_init();
+ if (ret) {
+ printk(KERN_INFO "gsmi: Failed to create efivars files\n");
+ efivars_unregister(&efivars);
+ goto out_remove_sysfs_files;
+ }
+
register_reboot_notifier(&gsmi_reboot_notifier);
register_die_notifier(&gsmi_die_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
@@ -919,7 +926,7 @@ static void __exit gsmi_exit(void)
unregister_die_notifier(&gsmi_die_notifier);
atomic_notifier_chain_unregister(&panic_notifier_list,
&gsmi_panic_notifier);
- unregister_efivars(&efivars);
+ efivars_unregister(&efivars);
sysfs_remove_files(gsmi_kobj, gsmi_attrs);
sysfs_remove_bin_file(gsmi_kobj, &eventlog_bin_attr);
diff --git a/include/linux/efi.h b/include/linux/efi.h
index d1d782a..78fc71d 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -663,6 +663,12 @@ 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
@@ -762,19 +768,73 @@ 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;
+};
+
+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, 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_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);
+
+int efivars_sysfs_init(void);
#endif /* CONFIG_EFI_VARS */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* RE: [PATCH 3/6] efivars: efivar_entry API
2013-04-04 12:18 ` [PATCH 3/6] efivars: efivar_entry API Matt Fleming
@ 2013-04-10 15:25 ` Seiji Aguchi
2013-04-11 13:34 ` Matt Fleming
0 siblings, 1 reply; 17+ messages in thread
From: Seiji Aguchi @ 2013-04-10 15:25 UTC (permalink / raw)
To: Matt Fleming, linux-efi
Cc: linux-kernel, Matt Fleming, Tom Gundersen, Matthew Garrett,
Jeremy Kerr, Tony Luck, Mike Waychison
> -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 {
> + 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 efivars *efivars = __efivars;
> + struct pstore_read_data *cb_data = data;
> char name[DUMP_NAME_LEN];
> int i;
> int cnt;
> - unsigned int part, size;
> - unsigned long time;
> -
> - while (&efivars->walk_entry->list != &efivars->list) {
> - if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid,
> - vendor)) {
> - for (i = 0; i < DUMP_NAME_LEN; i++) {
> - name[i] = efivars->walk_entry->var.VariableName[i];
> - }
> - if (sscanf(name, "dump-type%u-%u-%d-%lu",
> - type, &part, &cnt, &time) == 4) {
> - *id = part;
> - *count = cnt;
> - timespec->tv_sec = time;
> - timespec->tv_nsec = 0;
> - } else if (sscanf(name, "dump-type%u-%u-%lu",
> - type, &part, &time) == 3) {
> - /*
> - * Check if an old format,
> - * which doesn't support holding
> - * multiple logs, remains.
> - */
> - *id = part;
> - *count = 0;
> - timespec->tv_sec = time;
> - timespec->tv_nsec = 0;
> - } else {
> - efivars->walk_entry = list_entry(
> - efivars->walk_entry->list.next,
> - struct efivar_entry, list);
> - continue;
> - }
> + unsigned int part;
> + unsigned long time, size;
>
> - get_var_data_locked(efivars, &efivars->walk_entry->var);
> - size = efivars->walk_entry->var.DataSize;
> - *buf = kmalloc(size, GFP_KERNEL);
> - if (*buf == NULL)
> - return -ENOMEM;
> - memcpy(*buf, efivars->walk_entry->var.Data,
> - size);
> - efivars->walk_entry = list_entry(
> - efivars->walk_entry->list.next,
> - struct efivar_entry, list);
> - return size;
> - }
> - efivars->walk_entry = list_entry(efivars->walk_entry->list.next,
> - struct efivar_entry, list);
> - }
> - return 0;
> + 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);
Deadlocking will happen in this efivar_entry_size() because __efivars->lock is already hold
in efivar_entry_iter_begin().
> + *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,
> @@ -1382,36 +1221,7 @@ static int efi_pstore_write(enum pstore_type_id type,
> char name[DUMP_NAME_LEN];
> efi_char16_t efi_name[DUMP_NAME_LEN];
> efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
> - struct efivars *efivars = __efivars;
> int i, ret = 0;
> - efi_status_t status = EFI_NOT_FOUND;
> - unsigned long flags;
> -
> - if (pstore_cannot_block_path(reason)) {
> - /*
> - * If the lock is taken by another cpu in non-blocking path,
> - * this driver returns without entering firmware to avoid
> - * hanging up.
> - */
> - if (!spin_trylock_irqsave(&efivars->lock, flags))
> - return -EBUSY;
> - } else
> - spin_lock_irqsave(&efivars->lock, flags);
> -
> - /*
> - * Check if there is a space enough to log.
> - * size: a size of logging data
> - * DUMP_NAME_LEN * 2: a maximum size of variable name
> - */
> -
> - status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES,
> - size + DUMP_NAME_LEN * 2);
> -
> - if (status) {
> - spin_unlock_irqrestore(&efivars->lock, flags);
> - *id = part;
> - return -ENOSPC;
> - }
>
> sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
> get_seconds());
> @@ -1419,81 +1229,90 @@ static int efi_pstore_write(enum pstore_type_id type,
> for (i = 0; i < DUMP_NAME_LEN; i++)
> efi_name[i] = name[i];
>
> - efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,
> - size, psi->buf);
> + ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
> + !pstore_cannot_block_path(reason),
> + size, psi->buf);
>
> - spin_unlock_irqrestore(&efivars->lock, flags);
> -
> - if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
> + if (size && !ret && reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
Why do you add (size && !ret) checking?
If the purpose of this patch is just adding new API, we don't need to modify the logic.
> schedule_work(&efivar_work);
>
> *id = part;
> return ret;
> };
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH 3/6] efivars: efivar_entry API
2013-04-10 15:25 ` Seiji Aguchi
@ 2013-04-11 13:34 ` Matt Fleming
0 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-11 13:34 UTC (permalink / raw)
To: Seiji Aguchi
Cc: linux-efi, linux-kernel, Matt Fleming, Tom Gundersen,
Matthew Garrett, Jeremy Kerr, Tony Luck, Mike Waychison
On 10/04/13 16:25, Seiji Aguchi wrote:
>> + 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);
>
> Deadlocking will happen in this efivar_entry_size() because __efivars->lock is already hold
> in efivar_entry_iter_begin().
Good catch, thanks.
>> @@ -1419,81 +1229,90 @@ static int efi_pstore_write(enum pstore_type_id type,
>> for (i = 0; i < DUMP_NAME_LEN; i++)
>> efi_name[i] = name[i];
>>
>> - efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,
>> - size, psi->buf);
>> + ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
>> + !pstore_cannot_block_path(reason),
>> + size, psi->buf);
>>
>> - spin_unlock_irqrestore(&efivars->lock, flags);
>> -
>> - if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
>> + if (size && !ret && reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
>
> Why do you add (size && !ret) checking?
> If the purpose of this patch is just adding new API, we don't need to modify the logic.
That looks like a bug that slipped in. I'll fix it. Thanks!
--
Matt Fleming, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 4/6] efivars: Move pstore code into the new EFI directory
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
` (2 preceding siblings ...)
2013-04-04 12:18 ` [PATCH 3/6] efivars: efivar_entry API Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-04 12:18 ` [PATCH 5/6] efivarfs: Move to fs/efivarfs Matt Fleming
` (2 subsequent siblings)
6 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi
Cc: linux-kernel, Matt Fleming, Tom Gundersen, Seiji Aguchi,
Anton Vorontsov, Colin Cross, Kees Cook, Matthew Garrett,
Tony Luck
From: Matt Fleming <matt.fleming@intel.com>
efivars.c has grown far too large and needs to be divided up. Create a new
directory and move the persistence storage code to efi-pstore.c now that it
uses the new efivar API. This helps us to greatly reduce the size of efivars.c
and paves the way for moving other code out of efivars.c.
Note that because CONFIG_EFI_VARS can be built as a module efi-pstore must also
include support for buildilng as a module.
Cc: Tom Gundersen <teg@jklm.no>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: Colin Cross <ccross@android.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
MAINTAINERS | 2 +-
drivers/firmware/Kconfig | 42 +-----
drivers/firmware/Makefile | 1 +
drivers/firmware/efi/Kconfig | 45 ++++++
drivers/firmware/efi/Makefile | 4 +
drivers/firmware/efi/efi-pstore.c | 244 ++++++++++++++++++++++++++++++++
drivers/firmware/efivars.c | 277 ++-----------------------------------
include/linux/efi.h | 38 +++++
8 files changed, 346 insertions(+), 307 deletions(-)
create mode 100644 drivers/firmware/efi/Kconfig
create mode 100644 drivers/firmware/efi/Makefile
create mode 100644 drivers/firmware/efi/efi-pstore.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 4cf5fd3..9d106da 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6319,7 +6319,7 @@ S: Maintained
T: git git://git.infradead.org/users/cbou/linux-pstore.git
F: fs/pstore/
F: include/linux/pstore*
-F: drivers/firmware/efivars.c
+F: drivers/firmware/efi/efi-pstore.c
F: drivers/acpi/apei/erst.c
PTP HARDWARE CLOCK SUPPORT
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 96d84ad..9387630 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -36,47 +36,6 @@ config FIRMWARE_MEMMAP
See also Documentation/ABI/testing/sysfs-firmware-memmap.
-config EFI_VARS
- tristate "EFI Variable Support via sysfs"
- depends on EFI
- default n
- help
- If you say Y here, you are able to get EFI (Extensible Firmware
- Interface) variable information via sysfs. You may read,
- write, create, and destroy EFI variables through this interface.
-
- Note that using this driver in concert with efibootmgr requires
- at least test release version 0.5.0-test3 or later, which is
- available from Matt Domsch's website located at:
- <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
-
- Subsequent efibootmgr releases may be found at:
- <http://linux.dell.com/efibootmgr>
-
-config EFI_VARS_GENERIC_OPS
- bool
- depends on EFI
- depends on !GOOGLE_SMI
- default y
-
-config EFI_VARS_PSTORE
- bool "Register efivars backend for pstore"
- depends on EFI_VARS && PSTORE
- default y
- help
- Say Y here to enable use efivars as a backend to pstore. This
- will allow writing console messages, crash dumps, or anything
- else supported by pstore to EFI variables.
-
-config EFI_VARS_PSTORE_DEFAULT_DISABLE
- bool "Disable using efivars as a pstore backend by default"
- depends on EFI_VARS_PSTORE
- default n
- help
- Saying Y here will disable the use of efivars as a storage
- backend for pstore by default. This setting can be overridden
- using the efivars module's pstore_disable parameter.
-
config EFI_PCDP
bool "Console device selection via EFI PCDP or HCDP table"
depends on ACPI && EFI && IA64
@@ -170,5 +129,6 @@ config ISCSI_IBFT
Otherwise, say N.
source "drivers/firmware/google/Kconfig"
+source "drivers/firmware/efi/Kconfig"
endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 5a7e273..31bf68c 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
obj-$(CONFIG_GOOGLE_FIRMWARE) += google/
+obj-$(CONFIG_EFI) += efi/
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
new file mode 100644
index 0000000..c011f9c
--- /dev/null
+++ b/drivers/firmware/efi/Kconfig
@@ -0,0 +1,45 @@
+menu "EFI (Extensible Firmware Interface) Support"
+ depends on EFI
+
+config EFI_VARS
+ tristate "EFI Variable Support via sysfs"
+ depends on EFI
+ default n
+ help
+ If you say Y here, you are able to get EFI (Extensible Firmware
+ Interface) variable information via sysfs. You may read,
+ write, create, and destroy EFI variables through this interface.
+
+ Note that using this driver in concert with efibootmgr requires
+ at least test release version 0.5.0-test3 or later, which is
+ available from Matt Domsch's website located at:
+ <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
+
+ Subsequent efibootmgr releases may be found at:
+ <http://linux.dell.com/efibootmgr>
+
+config EFI_VARS_GENERIC_OPS
+ bool
+ depends on EFI
+ depends on !GOOGLE_SMI
+ default y
+
+config EFI_VARS_PSTORE
+ tristate "Register efivars backend for pstore"
+ depends on EFI_VARS && PSTORE
+ default y
+ help
+ Say Y here to enable use efivars as a backend to pstore. This
+ will allow writing console messages, crash dumps, or anything
+ else supported by pstore to EFI variables.
+
+config EFI_VARS_PSTORE_DEFAULT_DISABLE
+ bool "Disable using efivars as a pstore backend by default"
+ depends on EFI_VARS_PSTORE
+ default n
+ help
+ Saying Y here will disable the use of efivars as a storage
+ backend for pstore by default. This setting can be overridden
+ using the efivars module's pstore_disable parameter.
+
+endmenu
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
new file mode 100644
index 0000000..e03cd51
--- /dev/null
+++ b/drivers/firmware/efi/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for linux kernel
+#
+obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
new file mode 100644
index 0000000..088c6ae
--- /dev/null
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -0,0 +1,244 @@
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/pstore.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];
+
+ ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
+ !pstore_cannot_block_path(reason),
+ size, psi->buf);
+
+ if (size && !ret && 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;
+ unsigned long utf16_len = utf16_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, (size_t)utf16_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 (utf16_strncmp(entry->var.VariableName, efi_name_old,
+ utf16_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");
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index a0f5534..949d8d4 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -78,7 +78,6 @@
#include <linux/kobject.h>
#include <linux/device.h>
#include <linux/slab.h>
-#include <linux/pstore.h>
#include <linux/ctype.h>
#include <linux/fs.h>
@@ -95,15 +94,9 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables");
MODULE_LICENSE("GPL");
MODULE_VERSION(EFIVARS_VERSION);
-#define DUMP_NAME_LEN 52
-
static LIST_HEAD(efivarfs_list);
-static LIST_HEAD(efivar_sysfs_list);
-
-static bool efivars_pstore_disable =
- IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
-
-module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
+LIST_HEAD(efivar_sysfs_list);
+EXPORT_SYMBOL_GPL(efivar_sysfs_list);
struct efivar_attribute {
struct attribute attr;
@@ -114,11 +107,6 @@ struct efivar_attribute {
/* Private pointer to registered efivars */
static struct efivars *__efivars;
-#define PSTORE_EFI_ATTRIBUTES \
- (EFI_VARIABLE_NON_VOLATILE | \
- EFI_VARIABLE_BOOTSERVICE_ACCESS | \
- EFI_VARIABLE_RUNTIME_ACCESS)
-
static struct kset *efivars_kset;
static struct bin_attribute *efivars_new_var;
@@ -148,34 +136,6 @@ static void efivar_update_sysfs_entries(struct work_struct *);
static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
static bool efivar_wq_enabled = true;
-/*
- * 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--;
- }
-}
-
static bool
validate_device_path(struct efi_variable *var, int match, u8 *buffer,
unsigned long len)
@@ -598,12 +558,6 @@ static struct kobj_type efivar_ktype = {
.default_attrs = def_attrs,
};
-static inline void
-efivar_unregister(struct efivar_entry *var)
-{
- kobject_put(&var->kobj);
-}
-
static int efivarfs_file_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
@@ -1129,220 +1083,6 @@ static const struct inode_operations efivarfs_dir_inode_operations = {
.create = efivarfs_create,
};
-#ifdef CONFIG_EFI_VARS_PSTORE
-
-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];
-
- ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
- !pstore_cannot_block_path(reason),
- size, psi->buf);
-
- if (size && !ret && reason == KMSG_DUMP_OOPS && efivar_wq_enabled)
- schedule_work(&efivar_work);
-
- *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;
- unsigned long utf16_len = utf16_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, (size_t)utf16_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 (utf16_strncmp(entry->var.VariableName, efi_name_old,
- utf16_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 void efivar_pstore_register(void)
-{
- efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
- if (efi_pstore_info.buf) {
- efi_pstore_info.bufsize = 1024;
- spin_lock_init(&efi_pstore_info.buf_lock);
- pstore_register(&efi_pstore_info);
- }
-}
-#else
-static void efivar_pstore_register(void)
-{
- return;
-}
-#endif
-
static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t count)
@@ -2365,6 +2105,16 @@ struct kobject *efivars_kobject(void)
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
@@ -2382,9 +2132,6 @@ int efivars_register(struct efivars *efivars,
__efivars = efivars;
- if (!efivars_pstore_disable)
- efivar_pstore_register();
-
register_filesystem(&efivarfs_type);
return 0;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 78fc71d..a9f18e4 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -744,6 +744,34 @@ utf16_strlen(efi_char16_t *s)
#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
/*
+ * 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--;
+ }
+}
+
+/*
* EFI Variable support.
*
* Different firmware drivers can expose their EFI-like variables using
@@ -795,6 +823,14 @@ struct efivar_entry {
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 *kobject);
@@ -834,6 +870,8 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
+void efivar_run_worker(void);
+
int efivars_sysfs_init(void);
#endif /* CONFIG_EFI_VARS */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* [PATCH 5/6] efivarfs: Move to fs/efivarfs
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
` (3 preceding siblings ...)
2013-04-04 12:18 ` [PATCH 4/6] efivars: Move pstore code into the new EFI directory Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-04 12:18 ` [PATCH 6/6] efi: split efisubsystem from efivars Matt Fleming
2013-04-09 16:25 ` [PATCH 0/6] Chainsaw efivars.c H. Peter Anvin
6 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi
Cc: linux-kernel, Matt Fleming, Matthew Garrett, Jeremy Kerr, Tom Gundersen
From: Matt Fleming <matt.fleming@intel.com>
Now that efivarfs uses the efivar API, move it out of efivars.c and into
fs/efivarfs where it belongs. This move will eventually allow us to enable the
efivarfs code without having to also enable CONFIG_EFI_VARS built, and vice
versa.
Furthermore, things like,
mount -t efivarfs none /sys/firmware/efi/efivars
will now work if efivarfs is built as a module without requiring the use of
MODULE_ALIAS(), which would have been necessary when the efivarfs code was part
of efivars.c.
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Tom Gundersen <teg@jklm.no>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
MAINTAINERS | 9 +
drivers/firmware/efivars.c | 495 --------------------------------------------
fs/Kconfig | 1 +
fs/Makefile | 1 +
fs/efivarfs/Kconfig | 12 ++
fs/efivarfs/Makefile | 7 +
fs/efivarfs/file.c | 111 ++++++++++
fs/efivarfs/inode.c | 173 ++++++++++++++++
fs/efivarfs/internal.h | 22 ++
fs/efivarfs/super.c | 266 ++++++++++++++++++++++++
10 files changed, 602 insertions(+), 495 deletions(-)
create mode 100644 fs/efivarfs/Kconfig
create mode 100644 fs/efivarfs/Makefile
create mode 100644 fs/efivarfs/file.c
create mode 100644 fs/efivarfs/inode.c
create mode 100644 fs/efivarfs/internal.h
create mode 100644 fs/efivarfs/super.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 9d106da..ed131c3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2990,6 +2990,15 @@ F: arch/x86/platform/efi/*
F: drivers/firmware/efivars.c
F: include/linux/efi*.h
+EFI VARIABLE FILESYSTEM
+M: Matthew Garrett <matthew.garrett@nebula.com>
+M: Jeremy Kerr <jk@ozlabs.org>
+M: Matt Fleming <matt.fleming@intel.com>
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git
+L: linux-efi@vger.kernel.org
+S: Maintained
+F: fs/efivarfs/
+
EFIFB FRAMEBUFFER DRIVER
L: linux-fbdev@vger.kernel.org
M: Peter Jones <pjones@redhat.com>
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 949d8d4..f6fd57e 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -94,7 +94,6 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables");
MODULE_LICENSE("GPL");
MODULE_VERSION(EFIVARS_VERSION);
-static LIST_HEAD(efivarfs_list);
LIST_HEAD(efivar_sysfs_list);
EXPORT_SYMBOL_GPL(efivar_sysfs_list);
@@ -558,12 +557,6 @@ static struct kobj_type efivar_ktype = {
.default_attrs = def_attrs,
};
-static int efivarfs_file_open(struct inode *inode, struct file *file)
-{
- file->private_data = inode->i_private;
- return 0;
-}
-
static int efi_status_to_err(efi_status_t status)
{
int err;
@@ -597,492 +590,6 @@ static int efi_status_to_err(efi_status_t status)
return err;
}
-static ssize_t efivarfs_file_write(struct file *file,
- const char __user *userbuf, size_t count, loff_t *ppos)
-{
- struct efivar_entry *var = file->private_data;
- void *data;
- u32 attributes;
- struct inode *inode = file->f_mapping->host;
- unsigned long datasize = count - sizeof(attributes);
- ssize_t bytes = 0;
- bool set = false;
-
- if (count < sizeof(attributes))
- return -EINVAL;
-
- if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
- return -EFAULT;
-
- if (attributes & ~(EFI_VARIABLE_MASK))
- return -EINVAL;
-
- data = kmalloc(datasize, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
- bytes = -EFAULT;
- goto out;
- }
-
- bytes = efivar_entry_set_get_size(var, attributes, &datasize,
- data, &set);
- if (!set && bytes)
- goto out;
-
- if (!bytes) {
- mutex_lock(&inode->i_mutex);
- i_size_write(inode, datasize + sizeof(attributes));
- mutex_unlock(&inode->i_mutex);
- } else if (bytes == -ENOENT) {
- drop_nlink(inode);
- d_delete(file->f_dentry);
- dput(file->f_dentry);
- } else
- pr_warn("efivarfs: inconsistent EFI variable implementation? "
- "status=%zu\n", bytes);
-
- bytes = count;
-
-out:
- kfree(data);
-
- return bytes;
-}
-
-static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
- size_t count, loff_t *ppos)
-{
- struct efivar_entry *var = file->private_data;
- unsigned long datasize = 0;
- u32 attributes;
- void *data;
- ssize_t size = 0;
- int err;
-
- err = efivar_entry_size(var, &datasize);
- if (err)
- return err;
-
- data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
-
- if (!data)
- return -ENOMEM;
-
- size = efivar_entry_get(var, &attributes, &datasize,
- data + sizeof(attributes));
- if (size)
- goto out_free;
-
- memcpy(data, &attributes, sizeof(attributes));
- size = simple_read_from_buffer(userbuf, count, ppos,
- data, datasize + sizeof(attributes));
-out_free:
- kfree(data);
-
- return size;
-}
-
-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;
-
-static const struct inode_operations efivarfs_dir_inode_operations;
-
-static const struct file_operations efivarfs_file_operations = {
- .open = efivarfs_file_open,
- .read = efivarfs_file_read,
- .write = efivarfs_file_write,
- .llseek = no_llseek,
-};
-
-static struct inode *efivarfs_get_inode(struct super_block *sb,
- const struct inode *dir, int mode, dev_t dev)
-{
- struct inode *inode = new_inode(sb);
-
- if (inode) {
- inode->i_ino = get_next_ino();
- inode->i_mode = mode;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- switch (mode & S_IFMT) {
- case S_IFREG:
- inode->i_fop = &efivarfs_file_operations;
- break;
- case S_IFDIR:
- inode->i_op = &efivarfs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- inc_nlink(inode);
- break;
- }
- }
- return inode;
-}
-
-/*
- * Return true if 'str' is a valid efivarfs filename of the form,
- *
- * VariableName-12345678-1234-1234-1234-1234567891bc
- */
-static bool efivarfs_valid_name(const char *str, int len)
-{
- static const char dashes[EFI_VARIABLE_GUID_LEN] = {
- [8] = 1, [13] = 1, [18] = 1, [23] = 1
- };
- const char *s = str + len - EFI_VARIABLE_GUID_LEN;
- int i;
-
- /*
- * We need a GUID, plus at least one letter for the variable name,
- * plus the '-' separator
- */
- if (len < EFI_VARIABLE_GUID_LEN + 2)
- return false;
-
- /* GUID must be preceded by a '-' */
- if (*(s - 1) != '-')
- return false;
-
- /*
- * Validate that 's' is of the correct format, e.g.
- *
- * 12345678-1234-1234-1234-123456789abc
- */
- for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) {
- if (dashes[i]) {
- if (*s++ != '-')
- return false;
- } else {
- if (!isxdigit(*s++))
- return false;
- }
- }
-
- return true;
-}
-
-static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
-{
- guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
- guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
- guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
- guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
- guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
- guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
- guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
- guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
- guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
- guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
- guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
- guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
- guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
- guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
- guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
- guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
-}
-
-static int efivarfs_create(struct inode *dir, struct dentry *dentry,
- umode_t mode, bool excl)
-{
- struct inode *inode;
- struct efivar_entry *var;
- int namelen, i = 0, err = 0;
-
- if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len))
- return -EINVAL;
-
- inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
- if (!inode)
- return -ENOMEM;
-
- var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
- if (!var) {
- err = -ENOMEM;
- goto out;
- }
-
- /* length of the variable name itself: remove GUID and separator */
- namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1;
-
- efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
- &var->var.VendorGuid);
-
- for (i = 0; i < namelen; i++)
- var->var.VariableName[i] = dentry->d_name.name[i];
-
- var->var.VariableName[i] = '\0';
-
- inode->i_private = var;
-
- efivar_entry_add(var, &efivarfs_list);
- d_instantiate(dentry, inode);
- dget(dentry);
-out:
- if (err) {
- kfree(var);
- iput(inode);
- }
- return err;
-}
-
-static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct efivar_entry *var = dentry->d_inode->i_private;
-
- if (efivar_entry_delete(var))
- return -EINVAL;
-
- drop_nlink(dentry->d_inode);
- dput(dentry);
- return 0;
-};
-
-/*
- * 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 = utf16_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, &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,
-};
-MODULE_ALIAS_FS("efivarfs");
-
-/*
- * Handle negative dentry.
- */
-static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
-{
- if (dentry->d_name.len > NAME_MAX)
- return ERR_PTR(-ENAMETOOLONG);
- d_add(dentry, NULL);
- return NULL;
-}
-
-static const struct inode_operations efivarfs_dir_inode_operations = {
- .lookup = efivarfs_lookup,
- .unlink = efivarfs_unlink,
- .create = efivarfs_create,
-};
-
static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t count)
@@ -2132,8 +1639,6 @@ int efivars_register(struct efivars *efivars,
__efivars = efivars;
- register_filesystem(&efivarfs_type);
-
return 0;
}
EXPORT_SYMBOL_GPL(efivars_register);
diff --git a/fs/Kconfig b/fs/Kconfig
index 780725a..c229f82 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -211,6 +211,7 @@ source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/exofs/Kconfig"
source "fs/f2fs/Kconfig"
+source "fs/efivarfs/Kconfig"
endif # MISC_FILESYSTEMS
diff --git a/fs/Makefile b/fs/Makefile
index 9d53192..0fde6a3 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -127,3 +127,4 @@ obj-$(CONFIG_F2FS_FS) += f2fs/
obj-y += exofs/ # Multiple modules
obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/
+obj-$(CONFIG_EFIVAR_FS) += efivarfs/
diff --git a/fs/efivarfs/Kconfig b/fs/efivarfs/Kconfig
new file mode 100644
index 0000000..1fb2b7f
--- /dev/null
+++ b/fs/efivarfs/Kconfig
@@ -0,0 +1,12 @@
+config EFIVAR_FS
+ tristate "EFI Variable filesystem"
+ depends on EFI_VARS
+ help
+ efivarfs is a replacement filesystem for the old EFI
+ variable support via sysfs, as it doesn't suffer from the
+ same 1024-byte variable size limit.
+
+ To compile this file system support as a module, choose M
+ here. The module will be called efivarfs.
+
+ If unsure, say N.
diff --git a/fs/efivarfs/Makefile b/fs/efivarfs/Makefile
new file mode 100644
index 0000000..955d478
--- /dev/null
+++ b/fs/efivarfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the efivarfs filesystem
+#
+
+obj-$(CONFIG_EFIVAR_FS) += efivarfs.o
+
+efivarfs-objs := inode.o file.o super.o
diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c
new file mode 100644
index 0000000..aeb0368
--- /dev/null
+++ b/fs/efivarfs/file.c
@@ -0,0 +1,111 @@
+/*
+ * 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/efi.h>
+#include <linux/fs.h>
+
+#include "internal.h"
+
+static int efivarfs_file_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t efivarfs_file_write(struct file *file,
+ const char __user *userbuf, size_t count, loff_t *ppos)
+{
+ struct efivar_entry *var = file->private_data;
+ void *data;
+ u32 attributes;
+ struct inode *inode = file->f_mapping->host;
+ unsigned long datasize = count - sizeof(attributes);
+ ssize_t bytes = 0;
+ bool set = false;
+
+ if (count < sizeof(attributes))
+ return -EINVAL;
+
+ if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
+ return -EFAULT;
+
+ if (attributes & ~(EFI_VARIABLE_MASK))
+ return -EINVAL;
+
+ data = kmalloc(datasize, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
+ bytes = -EFAULT;
+ goto out;
+ }
+
+ bytes = efivar_entry_set_get_size(var, attributes, &datasize,
+ data, &set);
+ if (!set && bytes)
+ goto out;
+
+ if (bytes == -ENOENT) {
+ drop_nlink(inode);
+ d_delete(file->f_dentry);
+ dput(file->f_dentry);
+ } else {
+ mutex_lock(&inode->i_mutex);
+ i_size_write(inode, datasize + sizeof(attributes));
+ mutex_unlock(&inode->i_mutex);
+ }
+
+ bytes = count;
+
+out:
+ kfree(data);
+
+ return bytes;
+}
+
+static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct efivar_entry *var = file->private_data;
+ unsigned long datasize = 0;
+ u32 attributes;
+ void *data;
+ ssize_t size = 0;
+ int err;
+
+ err = efivar_entry_size(var, &datasize);
+ if (err)
+ return err;
+
+ data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
+
+ if (!data)
+ return -ENOMEM;
+
+ size = efivar_entry_get(var, &attributes, &datasize,
+ data + sizeof(attributes));
+ if (size)
+ goto out_free;
+
+ memcpy(data, &attributes, sizeof(attributes));
+ size = simple_read_from_buffer(userbuf, count, ppos,
+ data, datasize + sizeof(attributes));
+out_free:
+ kfree(data);
+
+ return size;
+}
+
+const struct file_operations efivarfs_file_operations = {
+ .open = efivarfs_file_open,
+ .read = efivarfs_file_read,
+ .write = efivarfs_file_write,
+ .llseek = no_llseek,
+};
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
new file mode 100644
index 0000000..640e289
--- /dev/null
+++ b/fs/efivarfs/inode.c
@@ -0,0 +1,173 @@
+/*
+ * 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/efi.h>
+#include <linux/fs.h>
+#include <linux/ctype.h>
+
+#include "internal.h"
+
+struct inode *efivarfs_get_inode(struct super_block *sb,
+ const struct inode *dir, int mode, dev_t dev)
+{
+ struct inode *inode = new_inode(sb);
+
+ if (inode) {
+ inode->i_ino = get_next_ino();
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ inode->i_fop = &efivarfs_file_operations;
+ break;
+ case S_IFDIR:
+ inode->i_op = &efivarfs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ inc_nlink(inode);
+ break;
+ }
+ }
+ return inode;
+}
+
+/*
+ * Return true if 'str' is a valid efivarfs filename of the form,
+ *
+ * VariableName-12345678-1234-1234-1234-1234567891bc
+ */
+bool efivarfs_valid_name(const char *str, int len)
+{
+ static const char dashes[EFI_VARIABLE_GUID_LEN] = {
+ [8] = 1, [13] = 1, [18] = 1, [23] = 1
+ };
+ const char *s = str + len - EFI_VARIABLE_GUID_LEN;
+ int i;
+
+ /*
+ * We need a GUID, plus at least one letter for the variable name,
+ * plus the '-' separator
+ */
+ if (len < EFI_VARIABLE_GUID_LEN + 2)
+ return false;
+
+ /* GUID must be preceded by a '-' */
+ if (*(s - 1) != '-')
+ return false;
+
+ /*
+ * Validate that 's' is of the correct format, e.g.
+ *
+ * 12345678-1234-1234-1234-123456789abc
+ */
+ for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) {
+ if (dashes[i]) {
+ if (*s++ != '-')
+ return false;
+ } else {
+ if (!isxdigit(*s++))
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
+{
+ guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
+ guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
+ guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
+ guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
+ guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
+ guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
+ guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
+ guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
+ guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
+ guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
+ guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
+ guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
+ guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
+ guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
+ guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
+ guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
+}
+
+static int efivarfs_create(struct inode *dir, struct dentry *dentry,
+ umode_t mode, bool excl)
+{
+ struct inode *inode;
+ struct efivar_entry *var;
+ int namelen, i = 0, err = 0;
+
+ if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len))
+ return -EINVAL;
+
+ inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
+ if (!inode)
+ return -ENOMEM;
+
+ var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
+ if (!var) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* length of the variable name itself: remove GUID and separator */
+ namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1;
+
+ efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
+ &var->var.VendorGuid);
+
+ for (i = 0; i < namelen; i++)
+ var->var.VariableName[i] = dentry->d_name.name[i];
+
+ var->var.VariableName[i] = '\0';
+
+ inode->i_private = var;
+
+ efivar_entry_add(var, &efivarfs_list);
+ d_instantiate(dentry, inode);
+ dget(dentry);
+out:
+ if (err) {
+ kfree(var);
+ iput(inode);
+ }
+ return err;
+}
+
+static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct efivar_entry *var = dentry->d_inode->i_private;
+
+ if (efivar_entry_delete(var))
+ return -EINVAL;
+
+ drop_nlink(dentry->d_inode);
+ dput(dentry);
+ return 0;
+};
+
+/*
+ * Handle negative dentry.
+ */
+static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int flags)
+{
+ if (dentry->d_name.len > NAME_MAX)
+ return ERR_PTR(-ENAMETOOLONG);
+ d_add(dentry, NULL);
+ return NULL;
+}
+
+const struct inode_operations efivarfs_dir_inode_operations = {
+ .lookup = efivarfs_lookup,
+ .unlink = efivarfs_unlink,
+ .create = efivarfs_create,
+};
diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h
new file mode 100644
index 0000000..b5ff16a
--- /dev/null
+++ b/fs/efivarfs/internal.h
@@ -0,0 +1,22 @@
+/*
+ * 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.
+ */
+#ifndef EFIVAR_FS_INTERNAL_H
+#define EFIVAR_FS_INTERNAL_H
+
+#include <linux/list.h>
+
+extern const struct file_operations efivarfs_file_operations;
+extern const struct inode_operations efivarfs_dir_inode_operations;
+extern bool efivarfs_valid_name(const char *str, int len);
+extern struct inode *efivarfs_get_inode(struct super_block *sb,
+ const struct inode *dir, int mode, dev_t dev);
+
+extern struct list_head efivarfs_list;
+
+#endif /* EFIVAR_FS_INTERNAL_H */
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
new file mode 100644
index 0000000..bfbd425
--- /dev/null
+++ b/fs/efivarfs/super.c
@@ -0,0 +1,266 @@
+/*
+ * 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 "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 = utf16_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, &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);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* [PATCH 6/6] efi: split efisubsystem from efivars
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
` (4 preceding siblings ...)
2013-04-04 12:18 ` [PATCH 5/6] efivarfs: Move to fs/efivarfs Matt Fleming
@ 2013-04-04 12:18 ` Matt Fleming
2013-04-09 16:25 ` [PATCH 0/6] Chainsaw efivars.c H. Peter Anvin
6 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-04 12:18 UTC (permalink / raw)
To: linux-efi
Cc: linux-kernel, Tom Gundersen, Seiji Aguchi, Tony Luck,
Mike Waychison, Matt Fleming, Kay Sievers, Jeremy Kerr,
Matthew Garrett, Chun-Yi Lee, Andy Whitcroft, Tobias Powalowski
From: Tom Gundersen <teg@jklm.no>
This registers /sys/firmware/efi/{,systab,efivars/} whenever EFI is enabled
and the system is booted with EFI.
This allows
*) userspace to check for the existence of /sys/firmware/efi as a way
to determine whether or it is running on an EFI system.
*) 'mount -t efivarfs none /sys/firmware/efi/efivars' without manually
loading any modules.
[ Also, move the efivar API into vars.c and unconditionally compile it.
This allows us to move efivars.c, which now only contains the sysfs
variable code, into the firmware/efi directory. Note that the efivars.c
filename is kept to maintain backwards compatability with the old
efivars.ko module. With this patch it is now possible for efivarfs
to be built without CONFIG_EFI_VARS - Matt ]
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Kay Sievers <kay@vrfy.org>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Chun-Yi Lee <jlee@suse.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Tobias Powalowski <tpowa@archlinux.org>
Signed-off-by: Tom Gundersen <teg@jklm.no>
---
MAINTAINERS | 2 +-
drivers/firmware/Makefile | 1 -
drivers/firmware/efi/Makefile | 2 +
drivers/firmware/efi/efi.c | 145 ++++
drivers/firmware/efi/efivars.c | 615 ++++++++++++++
drivers/firmware/efi/vars.c | 1020 +++++++++++++++++++++++
drivers/firmware/efivars.c | 1774 ----------------------------------------
fs/efivarfs/Kconfig | 2 +-
include/linux/efi.h | 3 +-
9 files changed, 1786 insertions(+), 1778 deletions(-)
create mode 100644 drivers/firmware/efi/efi.c
create mode 100644 drivers/firmware/efi/efivars.c
create mode 100644 drivers/firmware/efi/vars.c
delete mode 100644 drivers/firmware/efivars.c
diff --git a/MAINTAINERS b/MAINTAINERS
index ed131c3..96e9cbd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2987,7 +2987,7 @@ F: arch/ia64/kernel/efi.c
F: arch/x86/boot/compressed/eboot.[ch]
F: arch/x86/include/asm/efi.h
F: arch/x86/platform/efi/*
-F: drivers/firmware/efivars.c
+F: drivers/firmware/efi/*
F: include/linux/efi*.h
EFI VARIABLE FILESYSTEM
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 31bf68c..299fad6 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -4,7 +4,6 @@
obj-$(CONFIG_DMI) += dmi_scan.o
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
obj-$(CONFIG_EDD) += edd.o
-obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_EFI_PCDP) += pcdp.o
obj-$(CONFIG_DELL_RBU) += dell_rbu.o
obj-$(CONFIG_DCDBAS) += dcdbas.o
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index e03cd51..99245ab 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -1,4 +1,6 @@
#
# Makefile for linux kernel
#
+obj-y += efi.o vars.o
+obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
new file mode 100644
index 0000000..335e794
--- /dev/null
+++ b/drivers/firmware/efi/efi.c
@@ -0,0 +1,145 @@
+/*
+ * 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,
+};
+
+#ifdef CONFIG_EFI_VARS_GENERIC_OPS
+static struct efivars generic_efivars;
+static struct efivar_operations generic_ops;
+
+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_info = efi.query_variable_info;
+
+ return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
+}
+
+void generic_ops_unregister(void)
+{
+ efivars_unregister(&generic_efivars);
+}
+#else
+static inline int generic_ops_register(void)
+{
+ return 0;
+}
+
+static inline void generic_ops_unregister(void)
+{
+}
+#endif /* CONFIG_EFI_VARS_GENERIC_OPS */
+
+/*
+ * 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);
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
new file mode 100644
index 0000000..d69323f
--- /dev/null
+++ b/drivers/firmware/efi/efivars.c
@@ -0,0 +1,615 @@
+/*
+ * 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>
+
+#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 = utf16_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, &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, &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);
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
new file mode 100644
index 0000000..d7fcc79
--- /dev/null
+++ b/drivers/firmware/efi/vars.c
@@ -0,0 +1,1020 @@
+/*
+ * 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>
+
+/* 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;
+
+ namelen = utf16_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
+ */
+ desclength = utf16_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)
+{
+ u64 storage_size, remaining_size, max_size;
+ efi_status_t status;
+ const struct efivar_operations *fops = __efivars->ops;
+
+ if (!fops->query_variable_info)
+ return EFI_UNSUPPORTED;
+
+ 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;
+}
+
+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;
+
+ strsize1 = utf16_strsize(variable_name, 1024);
+ list_for_each_entry_safe(entry, n, head, list) {
+ strsize2 = utf16_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?
+ * @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, 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 (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;
+ }
+
+ status = check_var_size(attributes, size + utf16_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;
+
+ if (!ops->query_variable_info)
+ return -ENOSYS;
+
+ if (!block && spin_trylock_irqsave(&__efivars->lock, flags))
+ return -EBUSY;
+ else
+ spin_lock_irqsave(&__efivars->lock, flags);
+
+ status = check_var_size(attributes, size + utf16_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) {
+ strsize1 = utf16_strsize(name, 1024);
+ strsize2 = utf16_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
+ */
+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 + utf16_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);
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
deleted file mode 100644
index f6fd57e..0000000
--- a/drivers/firmware/efivars.c
+++ /dev/null
@@ -1,1774 +0,0 @@
-/*
- * EFI Variables - 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/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/kobject.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/ctype.h>
-
-#include <linux/fs.h>
-#include <linux/ramfs.h>
-#include <linux/pagemap.h>
-
-#include <asm/uaccess.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);
-
-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);
-};
-
-/* Private pointer to registered efivars */
-static struct efivars *__efivars;
-
-static struct kset *efivars_kset;
-
-static struct bin_attribute *efivars_new_var;
-static struct bin_attribute *efivars_del_var;
-
-#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);
-
-/*
- * Prototype for workqueue functions updating sysfs entry
- */
-
-static void efivar_update_sysfs_entries(struct work_struct *);
-static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
-static bool efivar_wq_enabled = true;
-
-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;
-
- namelen = utf16_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
- */
- desclength = utf16_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)
-{
- u64 storage_size, remaining_size, max_size;
- efi_status_t status;
- const struct efivar_operations *fops = __efivars->ops;
-
- if (!fops->query_variable_info)
- return EFI_UNSUPPORTED;
-
- 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;
-}
-
-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 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 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;
-}
-
-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;
-
- strsize1 = utf16_strsize(variable_name, 1024);
- list_for_each_entry_safe(entry, n, head, list) {
- strsize2 = utf16_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;
-}
-
-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;
-}
-
-/*
- * 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);
-}
-
-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, &efivar_sysfs_list);
- if (!err)
- break;
-
- efivar_create_sysfs_entry(entry);
- }
-
- kfree(entry);
-}
-
-/*
- * 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 kobject *efi_kobj;
-
-/**
- * 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 = utf16_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 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;
-}
-
-/*
- * 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);
-}
-
-static struct kobject *efivars_kobj;
-
-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);
- kobject_put(efivars_kobj);
- 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;
- }
-
- efivars_kobj = kobject_create_and_add("efivars", parent_kobj);
- if (!efivars_kobj) {
- pr_err("efivars: Subsystem registration failed.\n");
- kset_unregister(efivars_kset);
- return -ENOMEM;
- }
-
- efivar_init(efivars_sysfs_callback, NULL, false, &efivar_sysfs_list);
-
- error = create_efivars_bin_attributes();
- if (error)
- efivars_sysfs_exit();
-
- return error;
-}
-EXPORT_SYMBOL_GPL(efivars_sysfs_init);
-
-/**
- * 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?
- * @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, 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 (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 and remove @entry from the
- * variable list. It is the caller's responsibility to free @entry
- * once we return.
- *
- * This function differs from efivar_entry_delete() because 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. If set_variable() fails the entry remains
- * on the list.
- */
-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);
- if (status)
- return efi_status_to_err(status);
-
- list_del(&entry->list);
-
- return 0;
-}
-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;
- }
-
- status = check_var_size(attributes, size + utf16_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;
-
- if (!ops->query_variable_info)
- return -ENOSYS;
-
- if (!block && !spin_trylock_irqsave(&__efivars->lock, flags))
- return -EBUSY;
- else
- spin_lock_irqsave(&__efivars->lock, flags);
-
- status = check_var_size(attributes, size + utf16_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) {
- strsize1 = utf16_strsize(name, 1024);
- strsize2 = utf16_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
- */
-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 + utf16_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);
-
-#ifdef CONFIG_EFI_VARS_GENERIC_OPS
-static struct efivars generic_efivars;
-static struct efivar_operations generic_ops;
-
-int generic_ops_register(void)
-{
- int error;
-
- 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_info = efi.query_variable_info;
-
- error = efivars_register(&generic_efivars, &generic_ops, efi_kobj);
- if (error)
- return error;
-
- error = efivars_sysfs_init();
- if (error)
- efivars_unregister(&generic_efivars);
-
- return error;
-}
-
-void generic_ops_unregister(void)
-{
- efivars_sysfs_exit();
- efivars_unregister(&generic_efivars);
-}
-#else
-static inline int generic_ops_register(void)
-{
- return 0;
-}
-
-static inline void generic_ops_unregister(void)
-{
-}
-#endif /* CONFIG_EFI_VARS_GENERIC_OPS */
-
-/*
- * For now we register the efi subsystem with the firmware subsystem
- * and the vars subsystem with the efi subsystem. In the future, it
- * might make sense to split off the efi subsystem into its own
- * driver, but for now only efivars will register with it, so just
- * include it here.
- */
-
-static int __init
-efivars_init(void)
-{
- int error;
-
- if (!efi_enabled(EFI_RUNTIME_SERVICES))
- return 0;
-
- /* Register the efi directory at /sys/firmware/efi */
- efi_kobj = kobject_create_and_add("efi", firmware_kobj);
- if (!efi_kobj) {
- printk(KERN_ERR "efivars: Firmware registration failed.\n");
- return -ENOMEM;
- }
-
- error = generic_ops_register();
- if (error)
- goto err_put;
-
- /* Don't forget the systab entry */
- error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
- if (error) {
- printk(KERN_ERR
- "efivars: Sysfs attribute export failed with error %d.\n",
- error);
- goto err_unregister;
- }
-
- return 0;
-
-err_unregister:
- generic_ops_unregister();
-err_put:
- kobject_put(efi_kobj);
- return error;
-}
-
-static void __exit
-efivars_exit(void)
-{
- cancel_work_sync(&efivar_work);
-
- if (efi_enabled(EFI_RUNTIME_SERVICES)) {
- generic_ops_unregister();
- kobject_put(efi_kobj);
- }
-}
-
-module_init(efivars_init);
-module_exit(efivars_exit);
-
diff --git a/fs/efivarfs/Kconfig b/fs/efivarfs/Kconfig
index 1fb2b7f..367bbb1 100644
--- a/fs/efivarfs/Kconfig
+++ b/fs/efivarfs/Kconfig
@@ -1,6 +1,6 @@
config EFIVAR_FS
tristate "EFI Variable filesystem"
- depends on EFI_VARS
+ depends on EFI
help
efivarfs is a replacement filesystem for the old EFI
variable support via sysfs, as it doesn't suffer from the
diff --git a/include/linux/efi.h b/include/linux/efi.h
index a9f18e4..fc78d6c 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -742,7 +742,6 @@ utf16_strlen(efi_char16_t *s)
return utf16_strnlen(s, ~0UL);
}
-#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
/*
* Return the number of bytes is the length of this string
* Note: this is NOT the same as the number of unicode characters
@@ -870,8 +869,10 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
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 */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 17+ messages in thread* Re: [PATCH 0/6] Chainsaw efivars.c
2013-04-04 12:18 [PATCH 0/6] Chainsaw efivars.c Matt Fleming
` (5 preceding siblings ...)
2013-04-04 12:18 ` [PATCH 6/6] efi: split efisubsystem from efivars Matt Fleming
@ 2013-04-09 16:25 ` H. Peter Anvin
2013-04-09 16:50 ` Matt Fleming
6 siblings, 1 reply; 17+ messages in thread
From: H. Peter Anvin @ 2013-04-09 16:25 UTC (permalink / raw)
To: Matt Fleming, Matthew Garrett; +Cc: linux-efi, linux-kernel, Matt Fleming
On 04/04/2013 05:18 AM, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@intel.com>
>
> drivers/firmware/efivars.c has grown pretty large and is ~2K lines.
>
Hi Matt,
Are you expecting me or Matt G. to take this one?
-hpa
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH 0/6] Chainsaw efivars.c
2013-04-09 16:25 ` [PATCH 0/6] Chainsaw efivars.c H. Peter Anvin
@ 2013-04-09 16:50 ` Matt Fleming
0 siblings, 0 replies; 17+ messages in thread
From: Matt Fleming @ 2013-04-09 16:50 UTC (permalink / raw)
To: H. Peter Anvin; +Cc: Matt Fleming, Matthew Garrett, linux-efi, linux-kernel
On 09/04/13 17:25, H. Peter Anvin wrote:
> On 04/04/2013 05:18 AM, Matt Fleming wrote:
>> From: Matt Fleming <matt.fleming@intel.com>
>>
>> drivers/firmware/efivars.c has grown pretty large and is ~2K lines.
>>
>
> Hi Matt,
>
> Are you expecting me or Matt G. to take this one?
I was going to send it to you in a pull request once it had been
reviewed. It's a pretty invasive change and I was trying to avoid
breaking drivers/firmware/google in particular. I don't think it's
suitable for merging for v3.10, unless Mike and the pstore folks are
happy with it (and make it known fairly soon).
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