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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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81d7cac4d1
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> [mpe: Fixup maple/setup.c which needs platform_device] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230724210247.778034-1-robh@kernel.org
182 lines
3.3 KiB
C
182 lines
3.3 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/of.h>
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#include <linux/platform_device.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 ssize_t opal_secvar_format(char *buf, size_t bufsize)
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{
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ssize_t rc = 0;
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struct device_node *node;
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const char *format;
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node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
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if (!of_device_is_available(node)) {
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rc = -ENODEV;
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goto out;
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}
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rc = of_property_read_string(node, "format", &format);
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if (rc)
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goto out;
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rc = snprintf(buf, bufsize, "%s", format);
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out:
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of_node_put(node);
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return rc;
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}
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static int opal_secvar_max_size(u64 *max_size)
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{
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int rc;
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struct device_node *node;
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node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
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if (!node)
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return -ENODEV;
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if (!of_device_is_available(node)) {
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rc = -ENODEV;
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goto out;
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}
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rc = of_property_read_u64(node, "max-var-size", max_size);
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out:
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of_node_put(node);
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return 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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.format = opal_secvar_format,
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.max_size = opal_secvar_max_size,
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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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return set_secvar_ops(&opal_secvar_ops);
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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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