From: Greg Joyce <gjo...@linux.vnet.ibm.com>
Add platform specific interfaces arch_read_variable() and
arch_variable() to allow platform agnostic access to platform
variable stores.
Signed-off-by: Greg Joyce <gjo...@linux.vnet.ibm.com>
---
arch/powerpc/platforms/pseries/plpks/Makefile | 1 +
.../platforms/pseries/plpks/plpks_arch_ops.c | 163 ++++++++++++++++++
2 files changed, 164 insertions(+)
create mode 100644 arch/powerpc/platforms/pseries/plpks/plpks_arch_ops.c
diff --git a/arch/powerpc/platforms/pseries/plpks/Makefile
b/arch/powerpc/platforms/pseries/plpks/Makefile
index e651ace920db..3e9ce6f16575 100644
--- a/arch/powerpc/platforms/pseries/plpks/Makefile
+++ b/arch/powerpc/platforms/pseries/plpks/Makefile
@@ -5,3 +5,4 @@
#
obj-$(CONFIG_PSERIES_PLPKS) += plpks.o
+obj-$(CONFIG_PSERIES_PLPKS) += plpks_arch_ops.o
diff --git a/arch/powerpc/platforms/pseries/plpks/plpks_arch_ops.c
b/arch/powerpc/platforms/pseries/plpks/plpks_arch_ops.c
new file mode 100644
index 000000000000..11cd03da08b7
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/plpks/plpks_arch_ops.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * POWER platform keystore
+ * Copyright (C) 2022 IBM Corporation
+ *
+ * This pseries platform device driver provides access to
+ * variables stored in platform keystore.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/ioctl.h>
+#include <uapi/linux/sed-opal.h>
+#include <linux/sed-opal.h>
+#include <linux/arch_vars.h>
+#include <asm/plpks.h>
+
+/*
+ * variable structure that contains all SED data
+ */
+struct plpks_sed_object_data {
+ u_char version;
+ u_char pad1[7];
+ u_long authority;
+ u_long range;
+ u_int key_len;
+ u_char key[32];
+};
+
+/*
+ * ext_type values
+ * 00 no extension exists
+ * 01-1F common
+ * 20-3F AIX
+ * 40-5F Linux
+ * 60-7F IBMi
+ */
+
+/*
+ * This extension is optional for version 1 sed_object_data
+ */
+struct sed_object_extension {
+ u8 ext_type;
+ u8 rsvd[3];
+ u8 ext_data[64];
+};
+
+#define PKS_SED_OBJECT_DATA_V1 1
+#define PKS_SED_MANGLED_LABEL "/default/pri"
+#define PLPKS_SED_COMPONENT "sed-opal"
+#define PLPKS_SED_POLICY WORLDREADABLE
+#define PLPKS_SED_OS_COMMON 4
+
+#ifndef CONFIG_BLK_SED_OPAL
+#define OPAL_AUTH_KEY ""
+#endif
+
+/*
+ * Read the variable data from PKS given the label
+ */
+int arch_read_variable(enum arch_variable_type type, char *varname,
+ void *varbuf, u_int *varlen)
+{
+ struct plpks_var var;
+ struct plpks_sed_object_data *data;
+ u_int offset = 0;
+ char *buf = (char *)varbuf;
+ int ret;
+
+ var.name = varname;
+ var.namelen = strlen(varname);
+ var.policy = PLPKS_SED_POLICY;
+ var.os = PLPKS_SED_OS_COMMON;
+ var.data = NULL;
+ var.datalen = 0;
+
+ switch (type) {
+ case ARCH_VAR_OPAL_KEY:
+ var.component = PLPKS_SED_COMPONENT;
+ if (strcmp(OPAL_AUTH_KEY, varname) == 0) {
+ var.name = PKS_SED_MANGLED_LABEL;
+ var.namelen = strlen(varname);
+ }
+ offset = offsetof(struct plpks_sed_object_data, key);
+ break;
+ case ARCH_VAR_OTHER:
+ var.component = "";
+ break;
+ }
+
+ ret = plpks_read_os_var(&var);
+ if (ret != 0)
+ return ret;
+
+ if (offset > var.datalen)
+ offset = 0;
+
+ switch (type) {
+ case ARCH_VAR_OPAL_KEY:
+ data = (struct plpks_sed_object_data *)var.data;
+ *varlen = data->key_len;
+ break;
+ case ARCH_VAR_OTHER:
+ *varlen = var.datalen;
+ break;
+ }
+
+ if (var.data) {
+ memcpy(varbuf, var.data + offset, var.datalen - offset);
+ buf[*varlen] = '\0';
+ kfree(var.data);
+ }
+
+ return 0;
+}
+
+/*
+ * Write the variable data to PKS given the label
+ */
+int arch_write_variable(enum arch_variable_type type, char *varname,
+ void *varbuf, u_int varlen)
+{
+ struct plpks_var var;
+ struct plpks_sed_object_data data;
+ struct plpks_var_name vname;
+
+ var.name = varname;
+ var.namelen = strlen(varname);
+ var.policy = PLPKS_SED_POLICY;
+ var.os = PLPKS_SED_OS_COMMON;
+ var.datalen = varlen;
+ var.data = varbuf;
+
+ switch (type) {
+ case ARCH_VAR_OPAL_KEY:
+ var.component = PLPKS_SED_COMPONENT;
+ if (strcmp(OPAL_AUTH_KEY, varname) == 0) {
+ var.name = PKS_SED_MANGLED_LABEL;
+ var.namelen = strlen(varname);
+ }
+ var.datalen = sizeof(struct plpks_sed_object_data);
+ var.data = (u8 *)&data;
+
+ /* initialize SED object */
+ data.version = PKS_SED_OBJECT_DATA_V1;
+ data.authority = 0;
+ data.range = 0;
+ data.key_len = varlen;
+ memcpy(data.key, varbuf, varlen);
+ break;
+ case ARCH_VAR_OTHER:
+ var.component = "";
+ break;
+ }
+
+ /* variable update requires delete first */
+ vname.namelen = var.namelen;
+ vname.name = var.name;
+ (void)plpks_remove_var(PLPKS_SED_COMPONENT, PLPKS_SED_OS_COMMON, vname);
+
+ return plpks_write_var(var);
+}
--
2.27.0
