linux-kernel - Re: [HWMON] x86: hwmon/k8temp.c Add support for AMD 11H

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Message-Id: <1245938943.5308.56.camel@hpdv5.satnam>
Date:	Thu, 25 Jun 2009 19:39:03 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Rudolf Marek <r.marek@...embler.cz>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LM Sensors <lm-sensors@...sensors.org>,
	Chuck Ebbert <cebbert@...oraproject.org>,
	fedora-kernel-owner <kernel-owner@...oraproject.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [HWMON] x86: hwmon/k8temp.c Add support for AMD 11H

Ingo,

I need to apply and then revert this patch each and every time I fetch
-tip tree. And I need to do this many times like 20-30 times in a day.

I need this patch to monitor the temperature for AMD 11H box as it is
very hot here temp is around 47 C and my CPU temp goes high upto 87 C.
My one AMD box is already broken due to high temperature.

By using this patch I breaks building of the kernel as temperature
reaches 80 C.

I hope you understand my problem.

If possible, can you please apply this patch in tip:out-of-tree 
(not-for-upstream)

Thanks,
--
JSR

On Sat, 2009-06-20 at 13:26 +0530, Jaswinder Singh Rajput wrote:
> This patch will also work for AMD 10H. But we are skipping it as :
> 
> AMD 10H cpus reports Inaccurate Temperature Measurement:
> http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/41322.pdf
> Errata #319
> 
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  drivers/hwmon/k8temp.c |   31 +++++++++++++++++++++++++++++--
>  1 files changed, 29 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/k8temp.c b/drivers/hwmon/k8temp.c
> index 1fe9951..4459dbf 100644
> --- a/drivers/hwmon/k8temp.c
> +++ b/drivers/hwmon/k8temp.c
> @@ -1,5 +1,6 @@
>  /*
>   * k8temp.c - Linux kernel module for hardware monitoring
> + * 	      for AMD K8 and derivatives
>   *
>   * Copyright (C) 2006 Rudolf Marek <r.marek@...embler.cz>
>   *
> @@ -33,7 +34,7 @@
>  #include <linux/mutex.h>
>  #include <asm/processor.h>
>  
> -#define TEMP_FROM_REG(val)	(((((val) >> 16) & 0xff) - 49) * 1000)
> +#define REG_TCTL	0xa4
>  #define REG_TEMP	0xe4
>  #define SEL_PLACE	0x40
>  #define SEL_CORE	0x04
> @@ -52,6 +53,14 @@ struct k8temp_data {
>  	u32 temp_offset;
>  };
>  
> +static unsigned long temp_from_reg(unsigned long val)
> +{
> +	if (boot_cpu_data.x86 > 0xf)
> +		return ((val) >> 21) * 125;
> +	else
> +		return ((((val) >> 16) & 0xff) - 49) * 1000;
> +}
> +
>  static struct k8temp_data *k8temp_update_device(struct device *dev)
>  {
>  	struct k8temp_data *data = dev_get_drvdata(dev);
> @@ -62,6 +71,11 @@ static struct k8temp_data *k8temp_update_device(struct device *dev)
>  
>  	if (!data->valid
>  	    || time_after(jiffies, data->last_updated + HZ)) {
> +		if (boot_cpu_data.x86 > 0xf) {
> +			pci_read_config_dword(pdev, REG_TCTL,
> +					      &data->temp[0][0]);
> +			goto update_done;
> +		}
>  		pci_read_config_byte(pdev, REG_TEMP, &tmp);
>  		tmp &= ~(SEL_PLACE | SEL_CORE);		/* Select sensor 0, core0 */
>  		pci_write_config_byte(pdev, REG_TEMP, tmp);
> @@ -89,6 +103,7 @@ static struct k8temp_data *k8temp_update_device(struct device *dev)
>  			}
>  		}
>  
> +update_done:
>  		data->last_updated = jiffies;
>  		data->valid = 1;
>  	}
> @@ -123,7 +138,7 @@ static ssize_t show_temp(struct device *dev,
>  	if (data->swap_core_select)
>  		core = core ? 0 : 1;
>  
> -	temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
> +	temp = temp_from_reg(data->temp[core][place]) + data->temp_offset;
>  
>  	return sprintf(buf, "%d\n", temp);
>  }
> @@ -138,6 +153,14 @@ static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
>  
>  static struct pci_device_id k8temp_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
> +	/*
> +	 * AMD 10H cpus reports Inaccurate Temperature Measurement :
> +	 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/41322.pdf
> +	 *     Errata #319
> +	 * So skipping 10H
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
> +	 */
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
>  	{ 0 },
>  };
>  
> @@ -157,6 +180,9 @@ static int __devinit k8temp_probe(struct pci_dev *pdev,
>  		goto exit;
>  	}
>  
> +	if (boot_cpu_data.x86 > 0xf)
> +		goto probe_done;
> +
>  	model = boot_cpu_data.x86_model;
>  	stepping = boot_cpu_data.x86_mask;
>  
> @@ -226,6 +252,7 @@ static int __devinit k8temp_probe(struct pci_dev *pdev,
>  			data->sensorsp &= ~SEL_CORE;
>  	}
>  
> +probe_done:
>  	data->name = "k8temp";
>  	mutex_init(&data->update_lock);
>  	dev_set_drvdata(&pdev->dev, data);

--
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