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-rw-r--r--drivers/acpi/sysfs.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index e414fabf7315..faa1aa3ed0e1 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -306,11 +306,13 @@ module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
/*
* ACPI table sysfs I/F:
* /sys/firmware/acpi/tables/
+ * /sys/firmware/acpi/tables/data/
* /sys/firmware/acpi/tables/dynamic/
*/
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
+static struct kobject *tables_data_kobj;
static struct kobject *dynamic_tables_kobj;
static struct kobject *hotplug_kobj;
@@ -325,6 +327,11 @@ struct acpi_table_attr {
struct list_head node;
};
+struct acpi_data_attr {
+ struct bin_attribute attr;
+ u64 addr;
+};
+
static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t offset, size_t count)
@@ -420,6 +427,70 @@ acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
return AE_OK;
}
+static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t offset, size_t count)
+{
+ struct acpi_data_attr *data_attr;
+ void __iomem *base;
+ ssize_t rc;
+
+ data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
+
+ base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
+ if (!base)
+ return -ENOMEM;
+ rc = memory_read_from_buffer(buf, count, &offset, base,
+ data_attr->attr.size);
+ acpi_os_unmap_memory(base, data_attr->attr.size);
+
+ return rc;
+}
+
+static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
+{
+ struct acpi_table_bert *bert = th;
+
+ if (bert->header.length < sizeof(struct acpi_table_bert) ||
+ bert->region_length < sizeof(struct acpi_hest_generic_status)) {
+ kfree(data_attr);
+ return -EINVAL;
+ }
+ data_attr->addr = bert->address;
+ data_attr->attr.size = bert->region_length;
+ data_attr->attr.attr.name = "BERT";
+
+ return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
+}
+
+static struct acpi_data_obj {
+ char *name;
+ int (*fn)(void *, struct acpi_data_attr *);
+} acpi_data_objs[] = {
+ { ACPI_SIG_BERT, acpi_bert_data_init },
+};
+
+#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
+
+static int acpi_table_data_init(struct acpi_table_header *th)
+{
+ struct acpi_data_attr *data_attr;
+ int i;
+
+ for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
+ if (ACPI_COMPARE_NAME(th->signature, acpi_data_objs[i].name)) {
+ data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
+ if (!data_attr)
+ return -ENOMEM;
+ sysfs_attr_init(&data_attr->attr.attr);
+ data_attr->attr.read = acpi_data_show;
+ data_attr->attr.attr.mode = 0400;
+ return acpi_data_objs[i].fn(th, data_attr);
+ }
+ }
+ return 0;
+}
+
static int acpi_tables_sysfs_init(void)
{
struct acpi_table_attr *table_attr;
@@ -432,6 +503,10 @@ static int acpi_tables_sysfs_init(void)
if (!tables_kobj)
goto err;
+ tables_data_kobj = kobject_create_and_add("data", tables_kobj);
+ if (!tables_data_kobj)
+ goto err_tables_data;
+
dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
if (!dynamic_tables_kobj)
goto err_dynamic_tables;
@@ -456,13 +531,17 @@ static int acpi_tables_sysfs_init(void)
return ret;
}
list_add_tail(&table_attr->node, &acpi_table_attr_list);
+ acpi_table_data_init(table_header);
}
kobject_uevent(tables_kobj, KOBJ_ADD);
+ kobject_uevent(tables_data_kobj, KOBJ_ADD);
kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
return 0;
err_dynamic_tables:
+ kobject_put(tables_data_kobj);
+err_tables_data:
kobject_put(tables_kobj);
err:
return -ENOMEM;