firmware: Break out system_event_log in dmi-sysfs
The optional type 15 entry of the DMI table describes a non-volatile storage-backed system event log. In preparation for the next commit which exposes the raw bits of the event log to userland, create a new sub-directory within the dmi entry called "system_event_log" and expose attribute files that describe the event log itself. Currently, only a single child object is permitted within a dmi_sysfs_entry. We simply point at this child from the dmi_sysfs_entry if it exists. Signed-off-by: Mike Waychison <mikew@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mike Waychison
Greg Kroah-Hartman
parent
948af1f0bb
commit
925a1da747
|
|
@ -35,6 +35,7 @@ struct dmi_sysfs_entry {
|
|||
int instance;
|
||||
int position;
|
||||
struct list_head list;
|
||||
struct kobject *child;
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -77,6 +78,10 @@ struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_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)
|
||||
{
|
||||
|
|
@ -185,6 +190,146 @@ static size_t dmi_entry_length(const struct dmi_header *dh)
|
|||
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;
|
||||
|
||||
static const struct dmi_system_event_log *to_sel(const struct dmi_header *dh)
|
||||
{
|
||||
return (const struct dmi_system_event_log *)dh;
|
||||
}
|
||||
|
||||
#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) \
|
||||
{ \
|
||||
const struct dmi_system_event_log *sel = to_sel(dh); \
|
||||
if (sizeof(*sel) > dmi_entry_length(dh)) \
|
||||
return -EIO; \
|
||||
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,
|
||||
};
|
||||
|
||||
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;
|
||||
out_free:
|
||||
kfree(entry->child);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*************************************************
|
||||
* Generic DMI entry support.
|
||||
*************************************************/
|
||||
|
|
@ -325,6 +470,18 @@ static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
|
|||
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)
|
||||
|
|
@ -332,6 +489,7 @@ static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
|
|||
|
||||
return;
|
||||
out_err:
|
||||
kobject_put(entry->child);
|
||||
kobject_put(&entry->kobj);
|
||||
return;
|
||||
}
|
||||
|
|
@ -342,6 +500,7 @@ static void cleanup_entry_list(void)
|
|||
|
||||
/* 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);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Reference in New Issue