platform/x86/intel/ifs: Sysfs interface for Array BIST

The interface to trigger Array BIST test and obtain its result
is similar to the existing scan test. The only notable
difference is that, Array BIST doesn't require any test content
to be loaded. So binary load related options are not needed for
this test.

Add sysfs interface for array BIST test, the testing support will
be added by subsequent patch.

Signed-off-by: Jithu Joseph <[e-mail]>
Reviewed-by: Tony Luck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Hans de Goede <[e-mail]>

drivers/platform/x86/intel/ifs/core.c

···
 MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids);
 
 ATTRIBUTE_GROUPS(plat_ifs);
+ATTRIBUTE_GROUPS(plat_ifs_array);
 
 bool *ifs_pkg_auth;
 
···
 		.misc = {
 			.name = "intel_ifs_1",
 			.minor = MISC_DYNAMIC_MINOR,
+			.groups = plat_ifs_array_groups,
 		},
 	},
 };

drivers/platform/x86/intel/ifs/ifs.h

···
 int ifs_load_firmware(struct device *dev);
 int do_core_test(int cpu, struct device *dev);
 extern struct attribute *plat_ifs_attrs[];
+extern struct attribute *plat_ifs_array_attrs[];
 
 #endif

drivers/platform/x86/intel/ifs/runtest.c

···
  */
 int do_core_test(int cpu, struct device *dev)
 {
+	const struct ifs_test_caps *test = ifs_get_test_caps(dev);
+	struct ifs_data *ifsd = ifs_get_data(dev);
 	int ret = 0;
 
 	/* Prevent CPUs from being taken offline during the scan test */
···
 		goto out;
 	}
 
-	ifs_test_core(cpu, dev);
+	switch (test->test_num) {
+	case IFS_TYPE_SAF:
+		if (!ifsd->loaded)
+			return -EPERM;
+		ifs_test_core(cpu, dev);
+		break;
+	case IFS_TYPE_ARRAY_BIST:
+	default:
+		return -EINVAL;
+	}
 out:
 	cpus_read_unlock();
 	return ret;

drivers/platform/x86/intel/ifs/sysfs.c

···
 			      struct device_attribute *attr,
 			      const char *buf, size_t count)
 {
-	struct ifs_data *ifsd = ifs_get_data(dev);
 	unsigned int cpu;
 	int rc;
 
···
 	if (down_interruptible(&ifs_sem))
 		return -EINTR;
 
-	if (!ifsd->loaded)
-		rc = -EPERM;
-	else
-		rc = do_core_test(cpu, dev);
+	rc = do_core_test(cpu, dev);
 
 	up(&ifs_sem);
 
···
 	&dev_attr_run_test.attr,
 	&dev_attr_current_batch.attr,
 	&dev_attr_image_version.attr,
+	NULL
+};
+
+/* global array sysfs attributes */
+struct attribute *plat_ifs_array_attrs[] = {
+	&dev_attr_details.attr,
+	&dev_attr_status.attr,
+	&dev_attr_run_test.attr,
 	NULL
 };