On Wed, Mar 22, 2023 at 8:13 PM Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> wrote: > > 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@xxxxxxxxx> > Signed-off-by: Haibo Xu <haibo1.xu@xxxxxxxxx> > Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> > --- > > Changes since v2: > * Fixed the commit log as per review suggestion. > > Changes since v1: > * Removed unnecessary parenthesis as per Rafael's suggestion. > > drivers/acpi/sysfs.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c > index 7f4ff56c9d42..687524b50085 100644 > --- 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) > -- Applied as 6.4 material, thanks!
