linux-kernel - Re: [PATCH 1/2] platform/x86/amd/pmf: Add debugging message for missing policy data

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Date: Sun, 18 Feb 2024 11:26:57 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Mario Limonciello <mario.limonciello@....com>, Shyam-sundar.S-k@....com
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: [PATCH 1/2] platform/x86/amd/pmf: Add debugging message for
 missing policy data

Hi,

On 2/17/24 02:22, Mario Limonciello wrote:
> If a machine advertises Smart PC support but is missing policy data
> show a debugging message to help clarify why Smart PC wasn't enabled.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>  drivers/platform/x86/amd/pmf/tee-if.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
> index 8b7e3f87702e..1359ab340f7c 100644
> --- a/drivers/platform/x86/amd/pmf/tee-if.c
> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
> @@ -252,8 +252,10 @@ static int amd_pmf_start_policy_engine(struct amd_pmf_dev *dev)
>  	cookie = readl(dev->policy_buf + POLICY_COOKIE_OFFSET);
>  	length = readl(dev->policy_buf + POLICY_COOKIE_LEN);
>  
> -	if (cookie != POLICY_SIGN_COOKIE || !length)
> +	if (cookie != POLICY_SIGN_COOKIE || !length) {
> +		dev_dbg(dev->dev, "cookie doesn't match\n");
>  		return -EINVAL;
> +	}
>  
>  	/* Update the actual length */
>  	dev->policy_sz = length + 512;