efi: Expose underlying UEFI firmware platform size to userland

In some cases (e.g. Intel Bay Trail machines), the kernel will happily
run in 64-bit even if the underlying UEFI firmware platform is
32-bit. That's great, but it's difficult for userland utilities like
grub-install to do the right thing in such a situation.

The kernel already knows about the size of the firmware via
efi_enabled(EFI_64BIT). Add an extra sysfs interface
/sys/firmware/efi/fw_platform_size to expose that information to
userland for low-level utilities to use.

Signed-off-by: Steve McIntyre <steve@einval.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Gbp-Pq: Topic features/all
Gbp-Pq: Name efi-expose-underlying-uefi-firmware-platform-size-to.patch

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 8590099ac148aa767484236cbdd576b421c85303..889257a0c98c1d75d13275651d1073927ec29b13 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -112,15 +112,24 @@ EFI_ATTR_SHOW(fw_vendor);
 EFI_ATTR_SHOW(runtime);
 EFI_ATTR_SHOW(config_table);
 
+static ssize_t fw_platform_size_show(struct kobject *kobj,
+                                    struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
+}
+
 static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
 static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
 static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
+static struct kobj_attribute efi_attr_fw_platform_size =
+       __ATTR_RO(fw_platform_size);
 
 static struct attribute *efi_subsys_attrs[] = {
        &efi_attr_systab.attr,
        &efi_attr_fw_vendor.attr,
        &efi_attr_runtime.attr,
        &efi_attr_config_table.attr,
+       &efi_attr_fw_platform_size.attr,
        NULL,
 };