1 files changed, 96 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/plpks-sysfs.c b/arch/powerpc/platforms/pseries/plpks-sysfs.c
new file mode 100644
index 000000000000..c2ebcbb41ae3
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/plpks-sysfs.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2025 IBM Corporation, Srish Srinivasan <ssrish@linux.ibm.com>
+ *
+ * This code exposes PLPKS config to user via sysfs
+ */
+
+#define pr_fmt(fmt) "plpks-sysfs: "fmt
+
+#include <linux/init.h>
+#include <linux/printk.h>
+#include <linux/types.h>
+#include <asm/machdep.h>
+#include <asm/plpks.h>
+
+/* config attributes for sysfs */
+#define PLPKS_CONFIG_ATTR(name, fmt, func)			\
+	static ssize_t name##_show(struct kobject *kobj,	\
+				   struct kobj_attribute *attr,	\
+				   char *buf)			\
+	{							\
+		return sysfs_emit(buf, fmt, func());		\
+	}							\
+	static struct kobj_attribute attr_##name = __ATTR_RO(name)
+
+PLPKS_CONFIG_ATTR(version, "%u\n", plpks_get_version);
+PLPKS_CONFIG_ATTR(max_object_size, "%u\n", plpks_get_maxobjectsize);
+PLPKS_CONFIG_ATTR(total_size, "%u\n", plpks_get_totalsize);
+PLPKS_CONFIG_ATTR(used_space, "%u\n", plpks_get_usedspace);
+PLPKS_CONFIG_ATTR(supported_policies, "%08x\n", plpks_get_supportedpolicies);
+PLPKS_CONFIG_ATTR(signed_update_algorithms, "%016llx\n",
+		  plpks_get_signedupdatealgorithms);
+PLPKS_CONFIG_ATTR(wrapping_features, "%016llx\n", plpks_get_wrappingfeatures);
+
+static const struct attribute *config_attrs[] = {
+	&attr_version.attr,
+	&attr_max_object_size.attr,
+	&attr_total_size.attr,
+	&attr_used_space.attr,
+	&attr_supported_policies.attr,
+	&attr_signed_update_algorithms.attr,
+	&attr_wrapping_features.attr,
+	NULL,
+};
+
+static struct kobject *plpks_kobj, *plpks_config_kobj;
+
+int plpks_config_create_softlink(struct kobject *from)
+{
+	if (!plpks_config_kobj)
+		return -EINVAL;
+	return sysfs_create_link(from, plpks_config_kobj, "config");
+}
+
+static __init int plpks_sysfs_config(struct kobject *kobj)
+{
+	struct attribute_group config_group = {
+		.name = NULL,
+		.attrs = (struct attribute **)config_attrs,
+	};
+
+	return sysfs_create_group(kobj, &config_group);
+}
+
+static __init int plpks_sysfs_init(void)
+{
+	int rc;
+
+	if (!plpks_is_available())
+		return -ENODEV;
+
+	plpks_kobj = kobject_create_and_add("plpks", firmware_kobj);
+	if (!plpks_kobj) {
+		pr_err("Failed to create plpks kobj\n");
+		return -ENOMEM;
+	}
+
+	plpks_config_kobj = kobject_create_and_add("config", plpks_kobj);
+	if (!plpks_config_kobj) {
+		pr_err("Failed to create plpks config kobj\n");
+		kobject_put(plpks_kobj);
+		return -ENOMEM;
+	}
+
+	rc = plpks_sysfs_config(plpks_config_kobj);
+	if (rc) {
+		pr_err("Failed to create attribute group for plpks config\n");
+		kobject_put(plpks_config_kobj);
+		kobject_put(plpks_kobj);
+		return rc;
+	}
+
+	return 0;
+}
+
+machine_subsys_initcall(pseries, plpks_sysfs_init);