Commit 4f855dce authored by Kuppuswamy Sathyanarayanan's avatar Kuppuswamy Sathyanarayanan Committed by Rafael J. Wysocki
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ACPI: sysfs: Enable ACPI sysfs support for CCEL records 

The Confidential Computing Event Log (CCEL) table provides the address
and length of the CCEL records area in UEFI reserved memory.

To allow user space access to these records, expose a sysfs interface
similar to the BERT table.

More details about the CCEL table can be found in the ACPI specification
r6.5 [1], sec 5.2.34.

Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#cc-event-log-acpi-table

 # [1]
Co-developed-by: default avatarHaibo Xu <haibo1.xu@intel.com>
Signed-off-by: default avatarHaibo Xu <haibo1.xu@intel.com>
Signed-off-by: default avatarKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 197b6b60

drivers/acpi/sysfs.c

+17 −0
Original line number Diff line number Diff line
@@ -458,11 +458,28 @@ static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr) 
	return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);

}



static int acpi_ccel_data_init(void *th, struct acpi_data_attr *data_attr)

{

	struct acpi_table_ccel *ccel = th;



	if (ccel->header.length < sizeof(struct acpi_table_ccel) ||

	    !ccel->log_area_start_address || !ccel->log_area_minimum_length) {

		kfree(data_attr);

		return -EINVAL;

	}

	data_attr->addr = ccel->log_area_start_address;

	data_attr->attr.size = ccel->log_area_minimum_length;

	data_attr->attr.attr.name = "CCEL";



	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 },

	{ ACPI_SIG_CCEL, acpi_ccel_data_init },

};



#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)