mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Mike Waychison](/assets/img/avatar_default.png)
DMI entries are arranged in memory back to back with no alignment guarantees. This means that the struct dmi_header passed to callbacks from dmi_walk() itself isn't byte aligned. This causes problems on architectures that expect aligned data, such as IA64. The dmi-sysfs patchset introduced structure member accesses through this passed in dmi_header. Fix this by memcpy()ing the structures to temporary locations on stack when inspecting/copying them. Signed-off-by: Mike Waychison <mikew@google.com> Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
696 lines
17 KiB
C
696 lines
17 KiB
C
/*
|
|
* dmi-sysfs.c
|
|
*
|
|
* This module exports the DMI tables read-only to userspace through the
|
|
* sysfs file system.
|
|
*
|
|
* Data is currently found below
|
|
* /sys/firmware/dmi/...
|
|
*
|
|
* DMI attributes are presented in attribute files with names
|
|
* formatted using %d-%d, so that the first integer indicates the
|
|
* structure type (0-255), and the second field is the instance of that
|
|
* entry.
|
|
*
|
|
* Copyright 2011 Google, Inc.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/list.h>
|
|
#include <linux/io.h>
|
|
|
|
#define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider
|
|
the top entry type is only 8 bits */
|
|
|
|
struct dmi_sysfs_entry {
|
|
struct dmi_header dh;
|
|
struct kobject kobj;
|
|
int instance;
|
|
int position;
|
|
struct list_head list;
|
|
struct kobject *child;
|
|
};
|
|
|
|
/*
|
|
* Global list of dmi_sysfs_entry. Even though this should only be
|
|
* manipulated at setup and teardown, the lazy nature of the kobject
|
|
* system means we get lazy removes.
|
|
*/
|
|
static LIST_HEAD(entry_list);
|
|
static DEFINE_SPINLOCK(entry_list_lock);
|
|
|
|
/* dmi_sysfs_attribute - Top level attribute. used by all entries. */
|
|
struct dmi_sysfs_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf);
|
|
};
|
|
|
|
#define DMI_SYSFS_ATTR(_entry, _name) \
|
|
struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \
|
|
.attr = {.name = __stringify(_name), .mode = 0400}, \
|
|
.show = dmi_sysfs_##_entry##_##_name, \
|
|
}
|
|
|
|
/*
|
|
* dmi_sysfs_mapped_attribute - Attribute where we require the entry be
|
|
* mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops.
|
|
*/
|
|
struct dmi_sysfs_mapped_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_header *dh,
|
|
char *buf);
|
|
};
|
|
|
|
#define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \
|
|
struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \
|
|
.attr = {.name = __stringify(_name), .mode = 0400}, \
|
|
.show = dmi_sysfs_##_entry##_##_name, \
|
|
}
|
|
|
|
/*************************************************
|
|
* Generic DMI entry support.
|
|
*************************************************/
|
|
static void dmi_entry_free(struct kobject *kobj)
|
|
{
|
|
kfree(kobj);
|
|
}
|
|
|
|
static struct dmi_sysfs_entry *to_entry(struct kobject *kobj)
|
|
{
|
|
return container_of(kobj, struct dmi_sysfs_entry, kobj);
|
|
}
|
|
|
|
static struct dmi_sysfs_attribute *to_attr(struct attribute *attr)
|
|
{
|
|
return container_of(attr, struct dmi_sysfs_attribute, attr);
|
|
}
|
|
|
|
static ssize_t dmi_sysfs_attr_show(struct kobject *kobj,
|
|
struct attribute *_attr, char *buf)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj);
|
|
struct dmi_sysfs_attribute *attr = to_attr(_attr);
|
|
|
|
/* DMI stuff is only ever admin visible */
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
|
|
return attr->show(entry, buf);
|
|
}
|
|
|
|
static const struct sysfs_ops dmi_sysfs_attr_ops = {
|
|
.show = dmi_sysfs_attr_show,
|
|
};
|
|
|
|
typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *,
|
|
const struct dmi_header *dh, void *);
|
|
|
|
struct find_dmi_data {
|
|
struct dmi_sysfs_entry *entry;
|
|
dmi_callback callback;
|
|
void *private;
|
|
int instance_countdown;
|
|
ssize_t ret;
|
|
};
|
|
|
|
static void find_dmi_entry_helper(const struct dmi_header *dh,
|
|
void *_data)
|
|
{
|
|
struct find_dmi_data *data = _data;
|
|
struct dmi_sysfs_entry *entry = data->entry;
|
|
|
|
/* Is this the entry we want? */
|
|
if (dh->type != entry->dh.type)
|
|
return;
|
|
|
|
if (data->instance_countdown != 0) {
|
|
/* try the next instance? */
|
|
data->instance_countdown--;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Don't ever revisit the instance. Short circuit later
|
|
* instances by letting the instance_countdown run negative
|
|
*/
|
|
data->instance_countdown--;
|
|
|
|
/* Found the entry */
|
|
data->ret = data->callback(entry, dh, data->private);
|
|
}
|
|
|
|
/* State for passing the read parameters through dmi_find_entry() */
|
|
struct dmi_read_state {
|
|
char *buf;
|
|
loff_t pos;
|
|
size_t count;
|
|
};
|
|
|
|
static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry,
|
|
dmi_callback callback, void *private)
|
|
{
|
|
struct find_dmi_data data = {
|
|
.entry = entry,
|
|
.callback = callback,
|
|
.private = private,
|
|
.instance_countdown = entry->instance,
|
|
.ret = -EIO, /* To signal the entry disappeared */
|
|
};
|
|
int ret;
|
|
|
|
ret = dmi_walk(find_dmi_entry_helper, &data);
|
|
/* This shouldn't happen, but just in case. */
|
|
if (ret)
|
|
return -EINVAL;
|
|
return data.ret;
|
|
}
|
|
|
|
/*
|
|
* Calculate and return the byte length of the dmi entry identified by
|
|
* dh. This includes both the formatted portion as well as the
|
|
* unformatted string space, including the two trailing nul characters.
|
|
*/
|
|
static size_t dmi_entry_length(const struct dmi_header *dh)
|
|
{
|
|
const char *p = (const char *)dh;
|
|
|
|
p += dh->length;
|
|
|
|
while (p[0] || p[1])
|
|
p++;
|
|
|
|
return 2 + p - (const char *)dh;
|
|
}
|
|
|
|
/*************************************************
|
|
* Support bits for specialized DMI entry support
|
|
*************************************************/
|
|
struct dmi_entry_attr_show_data {
|
|
struct attribute *attr;
|
|
char *buf;
|
|
};
|
|
|
|
static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_header *dh,
|
|
void *_data)
|
|
{
|
|
struct dmi_entry_attr_show_data *data = _data;
|
|
struct dmi_sysfs_mapped_attribute *attr;
|
|
|
|
attr = container_of(data->attr,
|
|
struct dmi_sysfs_mapped_attribute, attr);
|
|
return attr->show(entry, dh, data->buf);
|
|
}
|
|
|
|
static ssize_t dmi_entry_attr_show(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct dmi_entry_attr_show_data data = {
|
|
.attr = attr,
|
|
.buf = buf,
|
|
};
|
|
/* Find the entry according to our parent and call the
|
|
* normalized show method hanging off of the attribute */
|
|
return find_dmi_entry(to_entry(kobj->parent),
|
|
dmi_entry_attr_show_helper, &data);
|
|
}
|
|
|
|
static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = {
|
|
.show = dmi_entry_attr_show,
|
|
};
|
|
|
|
/*************************************************
|
|
* Specialized DMI entry support.
|
|
*************************************************/
|
|
|
|
/*** Type 15 - System Event Table ***/
|
|
|
|
#define DMI_SEL_ACCESS_METHOD_IO8 0x00
|
|
#define DMI_SEL_ACCESS_METHOD_IO2x8 0x01
|
|
#define DMI_SEL_ACCESS_METHOD_IO16 0x02
|
|
#define DMI_SEL_ACCESS_METHOD_PHYS32 0x03
|
|
#define DMI_SEL_ACCESS_METHOD_GPNV 0x04
|
|
|
|
struct dmi_system_event_log {
|
|
struct dmi_header header;
|
|
u16 area_length;
|
|
u16 header_start_offset;
|
|
u16 data_start_offset;
|
|
u8 access_method;
|
|
u8 status;
|
|
u32 change_token;
|
|
union {
|
|
struct {
|
|
u16 index_addr;
|
|
u16 data_addr;
|
|
} io;
|
|
u32 phys_addr32;
|
|
u16 gpnv_handle;
|
|
u32 access_method_address;
|
|
};
|
|
u8 header_format;
|
|
u8 type_descriptors_supported_count;
|
|
u8 per_log_type_descriptor_length;
|
|
u8 supported_log_type_descriptos[0];
|
|
} __packed;
|
|
|
|
#define DMI_SYSFS_SEL_FIELD(_field) \
|
|
static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \
|
|
const struct dmi_header *dh, \
|
|
char *buf) \
|
|
{ \
|
|
struct dmi_system_event_log sel; \
|
|
if (sizeof(sel) > dmi_entry_length(dh)) \
|
|
return -EIO; \
|
|
memcpy(&sel, dh, sizeof(sel)); \
|
|
return sprintf(buf, "%u\n", sel._field); \
|
|
} \
|
|
static DMI_SYSFS_MAPPED_ATTR(sel, _field)
|
|
|
|
DMI_SYSFS_SEL_FIELD(area_length);
|
|
DMI_SYSFS_SEL_FIELD(header_start_offset);
|
|
DMI_SYSFS_SEL_FIELD(data_start_offset);
|
|
DMI_SYSFS_SEL_FIELD(access_method);
|
|
DMI_SYSFS_SEL_FIELD(status);
|
|
DMI_SYSFS_SEL_FIELD(change_token);
|
|
DMI_SYSFS_SEL_FIELD(access_method_address);
|
|
DMI_SYSFS_SEL_FIELD(header_format);
|
|
DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count);
|
|
DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length);
|
|
|
|
static struct attribute *dmi_sysfs_sel_attrs[] = {
|
|
&dmi_sysfs_attr_sel_area_length.attr,
|
|
&dmi_sysfs_attr_sel_header_start_offset.attr,
|
|
&dmi_sysfs_attr_sel_data_start_offset.attr,
|
|
&dmi_sysfs_attr_sel_access_method.attr,
|
|
&dmi_sysfs_attr_sel_status.attr,
|
|
&dmi_sysfs_attr_sel_change_token.attr,
|
|
&dmi_sysfs_attr_sel_access_method_address.attr,
|
|
&dmi_sysfs_attr_sel_header_format.attr,
|
|
&dmi_sysfs_attr_sel_type_descriptors_supported_count.attr,
|
|
&dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr,
|
|
NULL,
|
|
};
|
|
|
|
|
|
static struct kobj_type dmi_system_event_log_ktype = {
|
|
.release = dmi_entry_free,
|
|
.sysfs_ops = &dmi_sysfs_specialize_attr_ops,
|
|
.default_attrs = dmi_sysfs_sel_attrs,
|
|
};
|
|
|
|
typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel,
|
|
loff_t offset);
|
|
|
|
static DEFINE_MUTEX(io_port_lock);
|
|
|
|
static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel,
|
|
loff_t offset)
|
|
{
|
|
u8 ret;
|
|
|
|
mutex_lock(&io_port_lock);
|
|
outb((u8)offset, sel->io.index_addr);
|
|
ret = inb(sel->io.data_addr);
|
|
mutex_unlock(&io_port_lock);
|
|
return ret;
|
|
}
|
|
|
|
static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel,
|
|
loff_t offset)
|
|
{
|
|
u8 ret;
|
|
|
|
mutex_lock(&io_port_lock);
|
|
outb((u8)offset, sel->io.index_addr);
|
|
outb((u8)(offset >> 8), sel->io.index_addr + 1);
|
|
ret = inb(sel->io.data_addr);
|
|
mutex_unlock(&io_port_lock);
|
|
return ret;
|
|
}
|
|
|
|
static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel,
|
|
loff_t offset)
|
|
{
|
|
u8 ret;
|
|
|
|
mutex_lock(&io_port_lock);
|
|
outw((u16)offset, sel->io.index_addr);
|
|
ret = inb(sel->io.data_addr);
|
|
mutex_unlock(&io_port_lock);
|
|
return ret;
|
|
}
|
|
|
|
static sel_io_reader sel_io_readers[] = {
|
|
[DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io,
|
|
[DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io,
|
|
[DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io,
|
|
};
|
|
|
|
static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_system_event_log *sel,
|
|
char *buf, loff_t pos, size_t count)
|
|
{
|
|
ssize_t wrote = 0;
|
|
|
|
sel_io_reader io_reader = sel_io_readers[sel->access_method];
|
|
|
|
while (count && pos < sel->area_length) {
|
|
count--;
|
|
*(buf++) = io_reader(sel, pos++);
|
|
wrote++;
|
|
}
|
|
|
|
return wrote;
|
|
}
|
|
|
|
static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_system_event_log *sel,
|
|
char *buf, loff_t pos, size_t count)
|
|
{
|
|
u8 __iomem *mapped;
|
|
ssize_t wrote = 0;
|
|
|
|
mapped = ioremap(sel->access_method_address, sel->area_length);
|
|
if (!mapped)
|
|
return -EIO;
|
|
|
|
while (count && pos < sel->area_length) {
|
|
count--;
|
|
*(buf++) = readb(mapped + pos++);
|
|
wrote++;
|
|
}
|
|
|
|
iounmap(mapped);
|
|
return wrote;
|
|
}
|
|
|
|
static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_header *dh,
|
|
void *_state)
|
|
{
|
|
struct dmi_read_state *state = _state;
|
|
struct dmi_system_event_log sel;
|
|
|
|
if (sizeof(sel) > dmi_entry_length(dh))
|
|
return -EIO;
|
|
|
|
memcpy(&sel, dh, sizeof(sel));
|
|
|
|
switch (sel.access_method) {
|
|
case DMI_SEL_ACCESS_METHOD_IO8:
|
|
case DMI_SEL_ACCESS_METHOD_IO2x8:
|
|
case DMI_SEL_ACCESS_METHOD_IO16:
|
|
return dmi_sel_raw_read_io(entry, &sel, state->buf,
|
|
state->pos, state->count);
|
|
case DMI_SEL_ACCESS_METHOD_PHYS32:
|
|
return dmi_sel_raw_read_phys32(entry, &sel, state->buf,
|
|
state->pos, state->count);
|
|
case DMI_SEL_ACCESS_METHOD_GPNV:
|
|
pr_info("dmi-sysfs: GPNV support missing.\n");
|
|
return -EIO;
|
|
default:
|
|
pr_info("dmi-sysfs: Unknown access method %02x\n",
|
|
sel.access_method);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
static ssize_t dmi_sel_raw_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t pos, size_t count)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj->parent);
|
|
struct dmi_read_state state = {
|
|
.buf = buf,
|
|
.pos = pos,
|
|
.count = count,
|
|
};
|
|
|
|
return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state);
|
|
}
|
|
|
|
static struct bin_attribute dmi_sel_raw_attr = {
|
|
.attr = {.name = "raw_event_log", .mode = 0400},
|
|
.read = dmi_sel_raw_read,
|
|
};
|
|
|
|
static int dmi_system_event_log(struct dmi_sysfs_entry *entry)
|
|
{
|
|
int ret;
|
|
|
|
entry->child = kzalloc(sizeof(*entry->child), GFP_KERNEL);
|
|
if (!entry->child)
|
|
return -ENOMEM;
|
|
ret = kobject_init_and_add(entry->child,
|
|
&dmi_system_event_log_ktype,
|
|
&entry->kobj,
|
|
"system_event_log");
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr);
|
|
if (ret)
|
|
goto out_del;
|
|
|
|
return 0;
|
|
|
|
out_del:
|
|
kobject_del(entry->child);
|
|
out_free:
|
|
kfree(entry->child);
|
|
return ret;
|
|
}
|
|
|
|
/*************************************************
|
|
* Generic DMI entry support.
|
|
*************************************************/
|
|
|
|
static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->dh.length);
|
|
}
|
|
|
|
static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->dh.handle);
|
|
}
|
|
|
|
static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->dh.type);
|
|
}
|
|
|
|
static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->instance);
|
|
}
|
|
|
|
static ssize_t dmi_sysfs_entry_position(struct dmi_sysfs_entry *entry,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->position);
|
|
}
|
|
|
|
static DMI_SYSFS_ATTR(entry, length);
|
|
static DMI_SYSFS_ATTR(entry, handle);
|
|
static DMI_SYSFS_ATTR(entry, type);
|
|
static DMI_SYSFS_ATTR(entry, instance);
|
|
static DMI_SYSFS_ATTR(entry, position);
|
|
|
|
static struct attribute *dmi_sysfs_entry_attrs[] = {
|
|
&dmi_sysfs_attr_entry_length.attr,
|
|
&dmi_sysfs_attr_entry_handle.attr,
|
|
&dmi_sysfs_attr_entry_type.attr,
|
|
&dmi_sysfs_attr_entry_instance.attr,
|
|
&dmi_sysfs_attr_entry_position.attr,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t dmi_entry_raw_read_helper(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_header *dh,
|
|
void *_state)
|
|
{
|
|
struct dmi_read_state *state = _state;
|
|
size_t entry_length;
|
|
|
|
entry_length = dmi_entry_length(dh);
|
|
|
|
return memory_read_from_buffer(state->buf, state->count,
|
|
&state->pos, dh, entry_length);
|
|
}
|
|
|
|
static ssize_t dmi_entry_raw_read(struct file *filp,
|
|
struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t pos, size_t count)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj);
|
|
struct dmi_read_state state = {
|
|
.buf = buf,
|
|
.pos = pos,
|
|
.count = count,
|
|
};
|
|
|
|
return find_dmi_entry(entry, dmi_entry_raw_read_helper, &state);
|
|
}
|
|
|
|
static const struct bin_attribute dmi_entry_raw_attr = {
|
|
.attr = {.name = "raw", .mode = 0400},
|
|
.read = dmi_entry_raw_read,
|
|
};
|
|
|
|
static void dmi_sysfs_entry_release(struct kobject *kobj)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj);
|
|
sysfs_remove_bin_file(&entry->kobj, &dmi_entry_raw_attr);
|
|
spin_lock(&entry_list_lock);
|
|
list_del(&entry->list);
|
|
spin_unlock(&entry_list_lock);
|
|
kfree(entry);
|
|
}
|
|
|
|
static struct kobj_type dmi_sysfs_entry_ktype = {
|
|
.release = dmi_sysfs_entry_release,
|
|
.sysfs_ops = &dmi_sysfs_attr_ops,
|
|
.default_attrs = dmi_sysfs_entry_attrs,
|
|
};
|
|
|
|
static struct kobject *dmi_kobj;
|
|
static struct kset *dmi_kset;
|
|
|
|
/* Global count of all instances seen. Only for setup */
|
|
static int __initdata instance_counts[MAX_ENTRY_TYPE + 1];
|
|
|
|
/* Global positional count of all entries seen. Only for setup */
|
|
static int __initdata position_count;
|
|
|
|
static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
|
|
void *_ret)
|
|
{
|
|
struct dmi_sysfs_entry *entry;
|
|
int *ret = _ret;
|
|
|
|
/* If a previous entry saw an error, short circuit */
|
|
if (*ret)
|
|
return;
|
|
|
|
/* Allocate and register a new entry into the entries set */
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (!entry) {
|
|
*ret = -ENOMEM;
|
|
return;
|
|
}
|
|
|
|
/* Set the key */
|
|
memcpy(&entry->dh, dh, sizeof(*dh));
|
|
entry->instance = instance_counts[dh->type]++;
|
|
entry->position = position_count++;
|
|
|
|
entry->kobj.kset = dmi_kset;
|
|
*ret = kobject_init_and_add(&entry->kobj, &dmi_sysfs_entry_ktype, NULL,
|
|
"%d-%d", dh->type, entry->instance);
|
|
|
|
if (*ret) {
|
|
kfree(entry);
|
|
return;
|
|
}
|
|
|
|
/* Thread on the global list for cleanup */
|
|
spin_lock(&entry_list_lock);
|
|
list_add_tail(&entry->list, &entry_list);
|
|
spin_unlock(&entry_list_lock);
|
|
|
|
/* Handle specializations by type */
|
|
switch (dh->type) {
|
|
case DMI_ENTRY_SYSTEM_EVENT_LOG:
|
|
*ret = dmi_system_event_log(entry);
|
|
break;
|
|
default:
|
|
/* No specialization */
|
|
break;
|
|
}
|
|
if (*ret)
|
|
goto out_err;
|
|
|
|
/* Create the raw binary file to access the entry */
|
|
*ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr);
|
|
if (*ret)
|
|
goto out_err;
|
|
|
|
return;
|
|
out_err:
|
|
kobject_put(entry->child);
|
|
kobject_put(&entry->kobj);
|
|
return;
|
|
}
|
|
|
|
static void cleanup_entry_list(void)
|
|
{
|
|
struct dmi_sysfs_entry *entry, *next;
|
|
|
|
/* No locks, we are on our way out */
|
|
list_for_each_entry_safe(entry, next, &entry_list, list) {
|
|
kobject_put(entry->child);
|
|
kobject_put(&entry->kobj);
|
|
}
|
|
}
|
|
|
|
static int __init dmi_sysfs_init(void)
|
|
{
|
|
int error = -ENOMEM;
|
|
int val;
|
|
|
|
/* Set up our directory */
|
|
dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
|
|
if (!dmi_kobj)
|
|
goto err;
|
|
|
|
dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
|
|
if (!dmi_kset)
|
|
goto err;
|
|
|
|
val = 0;
|
|
error = dmi_walk(dmi_sysfs_register_handle, &val);
|
|
if (error)
|
|
goto err;
|
|
if (val) {
|
|
error = val;
|
|
goto err;
|
|
}
|
|
|
|
pr_debug("dmi-sysfs: loaded.\n");
|
|
|
|
return 0;
|
|
err:
|
|
cleanup_entry_list();
|
|
kset_unregister(dmi_kset);
|
|
kobject_put(dmi_kobj);
|
|
return error;
|
|
}
|
|
|
|
/* clean up everything. */
|
|
static void __exit dmi_sysfs_exit(void)
|
|
{
|
|
pr_debug("dmi-sysfs: unloading.\n");
|
|
cleanup_entry_list();
|
|
kset_unregister(dmi_kset);
|
|
kobject_put(dmi_kobj);
|
|
}
|
|
|
|
module_init(dmi_sysfs_init);
|
|
module_exit(dmi_sysfs_exit);
|
|
|
|
MODULE_AUTHOR("Mike Waychison <mikew@google.com>");
|
|
MODULE_DESCRIPTION("DMI sysfs support");
|
|
MODULE_LICENSE("GPL");
|