ACPI / sysfs: Extend ACPI sysfs to provide access to boot error region (7dae6326) · Commits · 戴 / test

drivers/acpi/sysfs.c

+79 −0

Original line number	Diff line number	Diff line
		@@ -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;

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