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>
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925a1da747
1 changed files with 159 additions and 0 deletions
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@ -35,6 +35,7 @@ struct dmi_sysfs_entry {
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int instance;
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int instance;
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int position;
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int position;
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struct list_head list;
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struct list_head list;
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struct kobject *child;
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};
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};
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/*
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/*
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@ -77,6 +78,10 @@ struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \
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/*************************************************
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/*************************************************
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* Generic DMI entry support.
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* Generic DMI entry support.
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*************************************************/
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*************************************************/
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static void dmi_entry_free(struct kobject *kobj)
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{
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kfree(kobj);
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}
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static struct dmi_sysfs_entry *to_entry(struct kobject *kobj)
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static struct dmi_sysfs_entry *to_entry(struct kobject *kobj)
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{
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{
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@ -185,6 +190,146 @@ static size_t dmi_entry_length(const struct dmi_header *dh)
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return 2 + p - (const char *)dh;
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return 2 + p - (const char *)dh;
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}
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}
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/*************************************************
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* Support bits for specialized DMI entry support
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*************************************************/
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struct dmi_entry_attr_show_data {
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struct attribute *attr;
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char *buf;
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};
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static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry,
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const struct dmi_header *dh,
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void *_data)
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{
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struct dmi_entry_attr_show_data *data = _data;
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struct dmi_sysfs_mapped_attribute *attr;
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attr = container_of(data->attr,
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struct dmi_sysfs_mapped_attribute, attr);
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return attr->show(entry, dh, data->buf);
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}
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static ssize_t dmi_entry_attr_show(struct kobject *kobj,
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struct attribute *attr,
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char *buf)
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{
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struct dmi_entry_attr_show_data data = {
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.attr = attr,
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.buf = buf,
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};
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/* Find the entry according to our parent and call the
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* normalized show method hanging off of the attribute */
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return find_dmi_entry(to_entry(kobj->parent),
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dmi_entry_attr_show_helper, &data);
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}
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static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = {
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.show = dmi_entry_attr_show,
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};
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/*************************************************
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* Specialized DMI entry support.
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*************************************************/
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/*** Type 15 - System Event Table ***/
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#define DMI_SEL_ACCESS_METHOD_IO8 0x00
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#define DMI_SEL_ACCESS_METHOD_IO2x8 0x01
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#define DMI_SEL_ACCESS_METHOD_IO16 0x02
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#define DMI_SEL_ACCESS_METHOD_PHYS32 0x03
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#define DMI_SEL_ACCESS_METHOD_GPNV 0x04
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struct dmi_system_event_log {
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struct dmi_header header;
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u16 area_length;
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u16 header_start_offset;
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u16 data_start_offset;
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u8 access_method;
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u8 status;
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u32 change_token;
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union {
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struct {
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u16 index_addr;
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u16 data_addr;
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} io;
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u32 phys_addr32;
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u16 gpnv_handle;
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u32 access_method_address;
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};
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u8 header_format;
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u8 type_descriptors_supported_count;
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u8 per_log_type_descriptor_length;
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u8 supported_log_type_descriptos[0];
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} __packed;
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static const struct dmi_system_event_log *to_sel(const struct dmi_header *dh)
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{
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return (const struct dmi_system_event_log *)dh;
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}
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#define DMI_SYSFS_SEL_FIELD(_field) \
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static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \
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const struct dmi_header *dh, \
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char *buf) \
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{ \
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const struct dmi_system_event_log *sel = to_sel(dh); \
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if (sizeof(*sel) > dmi_entry_length(dh)) \
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return -EIO; \
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return sprintf(buf, "%u\n", sel->_field); \
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} \
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static DMI_SYSFS_MAPPED_ATTR(sel, _field)
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DMI_SYSFS_SEL_FIELD(area_length);
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DMI_SYSFS_SEL_FIELD(header_start_offset);
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DMI_SYSFS_SEL_FIELD(data_start_offset);
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DMI_SYSFS_SEL_FIELD(access_method);
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DMI_SYSFS_SEL_FIELD(status);
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DMI_SYSFS_SEL_FIELD(change_token);
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DMI_SYSFS_SEL_FIELD(access_method_address);
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DMI_SYSFS_SEL_FIELD(header_format);
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DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count);
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DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length);
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static struct attribute *dmi_sysfs_sel_attrs[] = {
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&dmi_sysfs_attr_sel_area_length.attr,
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&dmi_sysfs_attr_sel_header_start_offset.attr,
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&dmi_sysfs_attr_sel_data_start_offset.attr,
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&dmi_sysfs_attr_sel_access_method.attr,
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&dmi_sysfs_attr_sel_status.attr,
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&dmi_sysfs_attr_sel_change_token.attr,
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&dmi_sysfs_attr_sel_access_method_address.attr,
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&dmi_sysfs_attr_sel_header_format.attr,
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&dmi_sysfs_attr_sel_type_descriptors_supported_count.attr,
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&dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr,
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NULL,
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};
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static struct kobj_type dmi_system_event_log_ktype = {
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.release = dmi_entry_free,
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.sysfs_ops = &dmi_sysfs_specialize_attr_ops,
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.default_attrs = dmi_sysfs_sel_attrs,
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};
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static int dmi_system_event_log(struct dmi_sysfs_entry *entry)
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{
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int ret;
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entry->child = kzalloc(sizeof(*entry->child), GFP_KERNEL);
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if (!entry->child)
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return -ENOMEM;
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ret = kobject_init_and_add(entry->child,
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&dmi_system_event_log_ktype,
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&entry->kobj,
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"system_event_log");
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if (ret)
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goto out_free;
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out_free:
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kfree(entry->child);
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return ret;
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}
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/*************************************************
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/*************************************************
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* Generic DMI entry support.
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* Generic DMI entry support.
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*************************************************/
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*************************************************/
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@ -325,6 +470,18 @@ static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
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list_add_tail(&entry->list, &entry_list);
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list_add_tail(&entry->list, &entry_list);
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spin_unlock(&entry_list_lock);
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spin_unlock(&entry_list_lock);
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/* Handle specializations by type */
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switch (dh->type) {
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case DMI_ENTRY_SYSTEM_EVENT_LOG:
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*ret = dmi_system_event_log(entry);
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break;
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default:
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/* No specialization */
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break;
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}
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if (*ret)
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goto out_err;
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/* Create the raw binary file to access the entry */
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/* Create the raw binary file to access the entry */
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*ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr);
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*ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr);
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if (*ret)
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if (*ret)
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@ -332,6 +489,7 @@ static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
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return;
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return;
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out_err:
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out_err:
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kobject_put(entry->child);
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kobject_put(&entry->kobj);
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kobject_put(&entry->kobj);
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return;
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return;
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}
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}
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@ -342,6 +500,7 @@ static void cleanup_entry_list(void)
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/* No locks, we are on our way out */
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/* No locks, we are on our way out */
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list_for_each_entry_safe(entry, next, &entry_list, list) {
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list_for_each_entry_safe(entry, next, &entry_list, list) {
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kobject_put(entry->child);
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kobject_put(&entry->kobj);
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kobject_put(&entry->kobj);
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}
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}
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}
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}
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