linux-kernel - Re: [PATCH 1/2] dell-smbios-base: Extends support to Alienware products

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Message-ID: <7dp62mqmqqgcjb4pyoszdmpml4vi364uui233iyspibah7qbbl@hgwc7vc2xyxd>
Date: Wed, 30 Oct 2024 17:33:45 -0300
From: Kurt Borja <kuurtb@...il.com>
To: Pali Rohár <pali@...nel.org>
Cc: ilpo.jarvinen@...ux.intel.com, hdegoede@...hat.com, w_armin@....de, 
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, Dell.Client.Kernel@...l.com
Subject: Re: [PATCH 1/2] dell-smbios-base: Extends support to Alienware
 products

On Wed, Oct 30, 2024 at 09:07:29PM +0100, Pali Rohár wrote:
> On Wednesday 30 October 2024 17:01:11 Kurt Borja wrote:
> > On Wed, Oct 30, 2024 at 07:26:13PM +0100, Pali Rohár wrote:
> > > On Wednesday 30 October 2024 15:12:45 Kurt Borja wrote:
> > > > Fixes the following error:
> > > > 
> > > > dell_smbios: Unable to run on non-Dell system
> > > > 
> > > > Which is triggered after dell-wmi driver fails to initialize on
> > > > Alienware systems, as it depends on dell-smbios.
> > > > 
> > > > This effectively adds dell-wmi and dell-smbios support to Alienware
> > > > products.
> > > > 
> > > > Signed-off-by: Kurt Borja <kuurtb@...il.com>
> > > > ---
> > > >  drivers/platform/x86/dell/dell-smbios-base.c | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > > 
> > > > diff --git a/drivers/platform/x86/dell/dell-smbios-base.c b/drivers/platform/x86/dell/dell-smbios-base.c
> > > > index 73e41eb69..01c72b91a 100644
> > > > --- a/drivers/platform/x86/dell/dell-smbios-base.c
> > > > +++ b/drivers/platform/x86/dell/dell-smbios-base.c
> > > > @@ -576,6 +576,7 @@ static int __init dell_smbios_init(void)
> > > >  	int ret, wmi, smm;
> > > >  
> > > >  	if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) &&
> > > > +	    !dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Alienware", NULL) &&
> > > 
> > > Are we sure that all devices with "Alienware" OEM string supports this SMBIOS API?
> > 
> > No, I am not sure.
> > 
> > However, I believe this driver is intended for general Dell SMBIOS 
> > implementations and automatically checks for support. I know this doesn't
> > necessarily extend to Alienware, so I hope some of the Dell maintainers
> > could shine some light on us.
> > 
> > I tested this on an Alienware x15 R1 and only some SMBIOS features
> > work, but no errors and dell-wmi-base works perfectly.
> 
> This is good to know. You should write into commit message on which
> platform you have tested this change. In case there would be some issues
> in future, it will help to for example whitelist working machines.

Perfect. I will.

> 
> I asked for this because for example dell hwmon driver has explicit list
> of working and non-working devices. And on some dell some machines just
> calling hwmon API cause issues...
> 
> So it is not just theoretical problem that allowing all devices from
> Dell with some generic OEM string can cause issues.

Yes, makes sense.

Also it is worth to mention that I checked a bunch of acpidumps of
different Dell models. I found three main ACPI implementations shared
between Dell's G-Series (which uses OEM STRING "Dell System") and 
Alienware X and M-Series. Obviously there might be some key differences I'm
ignoring, but it tells me the SMBIOS interface is probably implemented
similarily.

These three laptop series are all relatively new, this probably doesn't
apply to older Alienware devices.

Kurt

> 
> > > 
> > > >  	    !dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) {
> > > >  		pr_err("Unable to run on non-Dell system\n");
> > > >  		return -ENODEV;
> > > > -- 
> > > > 2.47.0
> > > >