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linux/arch/powerpc/include/asm/secvar.h
Andrew Donnellan 50a466bf3e powerpc/secvar: Allow backend to populate static list of variable names
Currently, the list of variables is populated by calling
secvar_ops->get_next() repeatedly, which is explicitly modelled on the
OPAL API (including the keylen parameter).

For the upcoming PLPKS backend, we have a static list of variable names.
It is messy to fit that into get_next(), so instead, let the backend put
a NULL-terminated array of variable names into secvar_ops->var_names,
which will be used if get_next() is undefined.

Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230210080401.345462-12-ajd@linux.ibm.com
2023-02-12 22:12:37 +11:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 IBM Corporation
* Author: Nayna Jain
*
* PowerPC secure variable operations.
*/
#ifndef SECVAR_OPS_H
#define SECVAR_OPS_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sysfs.h>
extern const struct secvar_operations *secvar_ops;
struct secvar_operations {
int (*get)(const char *key, u64 key_len, u8 *data, u64 *data_size);
int (*get_next)(const char *key, u64 *key_len, u64 keybufsize);
int (*set)(const char *key, u64 key_len, u8 *data, u64 data_size);
ssize_t (*format)(char *buf, size_t bufsize);
int (*max_size)(u64 *max_size);
const struct attribute **config_attrs;
// NULL-terminated array of fixed variable names
// Only used if get_next() isn't provided
const char * const *var_names;
};
#ifdef CONFIG_PPC_SECURE_BOOT
int set_secvar_ops(const struct secvar_operations *ops);
#else
static inline int set_secvar_ops(const struct secvar_operations *ops) { return 0; }
#endif
#endif