linux-kernel - Re: [PATCH v2] platform/x86/amd: Don't allow HSMP to be loaded on non-server hardware

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Message-ID: <e2567d94-6280-42b6-acd0-bf4aba90883b@redhat.com>
Date: Mon, 22 Apr 2024 15:31:28 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Mario Limonciello <superm1@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@....com>,
 Carlos Bilbao <carlos.bilbao@....com>,
 "open list:AMD HSMP DRIVER" <platform-driver-x86@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2] platform/x86/amd: Don't allow HSMP to be loaded on
 non-server hardware

Hi,

On 4/16/24 8:20 PM, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> If the HSMP driver is compiled into the kernel or a module manually loaded
> on client hardware it can cause problems with the functionality of the PMC
> module since it probes a mailbox with a different definition on servers.
> 
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2414
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3285
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans




> ---
> v1->v2:
>  * use pm preferred profile instead
> ---
>  drivers/platform/x86/amd/hsmp.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/platform/x86/amd/hsmp.c b/drivers/platform/x86/amd/hsmp.c
> index 1927be901108..102a49c3e945 100644
> --- a/drivers/platform/x86/amd/hsmp.c
> +++ b/drivers/platform/x86/amd/hsmp.c
> @@ -907,6 +907,17 @@ static int hsmp_plat_dev_register(void)
>  	return ret;
>  }
>  
> +static bool hsmp_supported_profile(void)
> +{
> +	switch (acpi_gbl_FADT.preferred_profile) {
> +	case PM_ENTERPRISE_SERVER:
> +	case PM_SOHO_SERVER:
> +	case PM_PERFORMANCE_SERVER:
> +		return true;
> +	}
> +	return false;
> +}
> +
>  static int __init hsmp_plt_init(void)
>  {
>  	int ret = -ENODEV;
> @@ -917,6 +928,11 @@ static int __init hsmp_plt_init(void)
>  		return ret;
>  	}
>  
> +	if (!hsmp_supported_profile()) {
> +		pr_err("HSMP is only supported on servers");
> +		return ret;
> +	}
> +
>  	/*
>  	 * amd_nb_num() returns number of SMN/DF interfaces present in the system
>  	 * if we have N SMN/DF interfaces that ideally means N sockets