linux-kernel - Re: [lm-sensors] coretemp support for Core i5 CPU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090920211620.1c18d7fb@hyperion.delvare>
Date:	Sun, 20 Sep 2009 21:16:20 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] coretemp support for Core i5 CPU

Hi Robert,

On Sun, 20 Sep 2009 01:47:43 -0600, Robert Hancock wrote:
> Trying to load the coretemp driver for CPU temperature monitoring on a 
> Core i5 750 CPU gives:
> 
> coretemp: Unknown CPU model 1e
> coretemp: Unknown CPU model 1e
> coretemp: Unknown CPU model 1e
> coretemp: Unknown CPU model 1e
> 
> Looks like this model needs to be added to the list in 
> drivers/hwmon/coretemp.c. Though this doesn't really seem like a very 
> good approach as we'll keep having to update this driver whenever a new 
> CPU model gets released. Intel has a CPUID field that indicates if the 
> thermal sensor is supported: "The processor supports a digital thermal 
> sensor if CPUID.06H.EAX[0] = 1." We should likely be using this instead 
> of hard-coded CPU model checks..

Supporting the digital thermal sensor is one thing, but it is totally
insufficient. If you look at the coretemp driver, you'll see we need to
figure out a number of calibration values which are model-dependent. So
we will need to check this part before adding support for new CPU
models anyway.

-- 
Jean Delvare
http://khali.linux-fr.org/wishlist.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/