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
Co-developed-by: Haibo Xu <haibo1.xu@intel.com>
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 7f4ff56c9d4260ad5deadd146b9759d32d7d4615..687524b5008592c58c021f9c7981b76eaa58038f 100644 (file)
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -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)