53cea34b0a
There's no reason for secvar_operations to use uint64_t vs the more common kernel type u64. The types are compatible, but they require different printk format strings which can lead to confusion. Change all the secvar related routines to use u64. Reviewed-by: Russell Currey <ruscur@russell.cc> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20230210080401.345462-5-ajd@linux.ibm.com
138 lines
2.5 KiB
C
138 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PowerNV code for secure variables
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*
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* Copyright (C) 2019 IBM Corporation
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* Author: Claudio Carvalho
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* Nayna Jain
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*
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* APIs to access secure variables managed by OPAL.
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*/
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#define pr_fmt(fmt) "secvar: "fmt
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#include <linux/types.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <asm/opal.h>
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#include <asm/secvar.h>
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#include <asm/secure_boot.h>
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static int opal_status_to_err(int rc)
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{
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int err;
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switch (rc) {
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case OPAL_SUCCESS:
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err = 0;
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break;
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case OPAL_UNSUPPORTED:
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err = -ENXIO;
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break;
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case OPAL_PARAMETER:
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err = -EINVAL;
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break;
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case OPAL_RESOURCE:
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err = -ENOSPC;
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break;
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case OPAL_HARDWARE:
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err = -EIO;
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break;
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case OPAL_NO_MEM:
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err = -ENOMEM;
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break;
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case OPAL_EMPTY:
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err = -ENOENT;
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break;
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case OPAL_PARTIAL:
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err = -EFBIG;
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break;
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default:
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err = -EINVAL;
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}
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return err;
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}
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static int opal_get_variable(const char *key, u64 ksize, u8 *data, u64 *dsize)
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{
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int rc;
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if (!key || !dsize)
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return -EINVAL;
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*dsize = cpu_to_be64(*dsize);
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rc = opal_secvar_get(key, ksize, data, dsize);
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*dsize = be64_to_cpu(*dsize);
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return opal_status_to_err(rc);
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}
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static int opal_get_next_variable(const char *key, u64 *keylen, u64 keybufsize)
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{
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int rc;
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if (!key || !keylen)
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return -EINVAL;
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*keylen = cpu_to_be64(*keylen);
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rc = opal_secvar_get_next(key, keylen, keybufsize);
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*keylen = be64_to_cpu(*keylen);
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return opal_status_to_err(rc);
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}
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static int opal_set_variable(const char *key, u64 ksize, u8 *data, u64 dsize)
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{
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int rc;
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if (!key || !data)
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return -EINVAL;
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rc = opal_secvar_enqueue_update(key, ksize, data, dsize);
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return opal_status_to_err(rc);
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}
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static const struct secvar_operations opal_secvar_ops = {
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.get = opal_get_variable,
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.get_next = opal_get_next_variable,
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.set = opal_set_variable,
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};
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static int opal_secvar_probe(struct platform_device *pdev)
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{
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if (!opal_check_token(OPAL_SECVAR_GET)
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|| !opal_check_token(OPAL_SECVAR_GET_NEXT)
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|| !opal_check_token(OPAL_SECVAR_ENQUEUE_UPDATE)) {
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pr_err("OPAL doesn't support secure variables\n");
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return -ENODEV;
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}
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set_secvar_ops(&opal_secvar_ops);
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return 0;
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}
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static const struct of_device_id opal_secvar_match[] = {
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{ .compatible = "ibm,secvar-backend",},
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{},
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};
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static struct platform_driver opal_secvar_driver = {
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.driver = {
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.name = "secvar",
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.of_match_table = opal_secvar_match,
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},
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};
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static int __init opal_secvar_init(void)
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{
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return platform_driver_probe(&opal_secvar_driver, opal_secvar_probe);
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}
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device_initcall(opal_secvar_init);
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