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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: 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>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2023-03-22 12:13:13 -07:00 committed by Rafael J. Wysocki
parent 197b6b60ae
commit 4f855dcead
1 changed files with 17 additions and 0 deletions
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17
drivers/acpi/sysfs.c
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@ -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)