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ACPI: sysfs: Enable ACPI sysfs support for CCEL records

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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)