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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Nayna Jain <nayna@linux.ibm.com>, linuxppc-dev@ozlabs.org,
        linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Jeremy Kerr <jk@ozlabs.org>,
        Matthew Garret <matthew.garret@nebula.com>,
        Mimi Zohar <zohar@linux.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Claudio Carvalho <cclaudio@linux.ibm.com>,
        George Wilson <gcwilson@linux.ibm.com>,
        Elaine Palmer <erpalmer@us.ibm.com>,
        Eric Ricther <erichte@linux.ibm.com>,
        Oliver O'Halloran <oohall@gmail.com>,
        Nayna Jain <nayna@linux.ibm.com>,
        Prakhar Srivastava <prsriva02@gmail.com>,
        Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Subject: Re: [PATCH v8 3/8] powerpc: detect the trusted boot state of the system
In-Reply-To: <1571508377-23603-4-git-send-email-nayna@linux.ibm.com>
References: <1571508377-23603-1-git-send-email-nayna@linux.ibm.com> <1571508377-23603-4-git-send-email-nayna@linux.ibm.com>
Date:   Wed, 23 Oct 2019 10:38:38 +1100
Message-ID: <87wocw5p1d.fsf@mpe.ellerman.id.au>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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Nayna Jain <nayna@linux.ibm.com> writes:
> diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
> index 99bba7915629..9753470ab08a 100644
> --- a/arch/powerpc/kernel/secure_boot.c
> +++ b/arch/powerpc/kernel/secure_boot.c
> @@ -28,3 +39,16 @@ bool is_ppc_secureboot_enabled(void)
>  	pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
>  	return enabled;
>  }
> +
> +bool is_ppc_trustedboot_enabled(void)
> +{
> +	struct device_node *node;
> +	bool enabled = false;
> +
> +	node = get_ppc_fw_sb_node();
> +	enabled = of_property_read_bool(node, "trusted-enabled");

Also here you need:

	of_node_put(node);

> +
> +	pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
> +
> +	return enabled;
> +}

cheers