linux-kernel - Re: [PATCH]PCIe AER: reject aer inject if hardware mask error reporting

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Date:	Mon, 14 Dec 2009 17:29:14 -0700
From:	Andrew Patterson <andrew.patterson@...com>
To:	"Youquan,Song" <youquan.song@...ux.intel.com>
Cc:	jbarnes@...tuousgeek.org, andi@...stfloor.org,
	ying.huang@...el.com, kent.liu@...el.com, youquan.song@...el.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH]PCIe AER: reject aer inject if hardware mask error
 reporting

On Fri, 2009-12-11 at 18:48 -0500, Youquan,Song wrote:
> Correcteable/Uncorrectable Error Mask Register are used by PCIe AER driver 
> which will controls the reporting of idividual errors to PCIe RC via PCIe
> error messages. 
> 
> If hardware masks special error reporting to RC, the aer_inject driver should
>  not inject aer error.
> 
> Signed-off-by: Youquan, Song <youquan.song@...el.com>
> Acked-by: Ying, Huang <ying.huang@...el.com>
> ---
> 
> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c
> index ad77f0c..fa2bc22 100644
> --- a/drivers/pci/pcie/aer/aer_inject.c
> +++ b/drivers/pci/pcie/aer/aer_inject.c
> @@ -302,7 +302,7 @@ static int aer_inject(struct aer_error_inj *einj)
>  	unsigned long flags;
>  	unsigned int devfn = PCI_DEVFN(einj->dev, einj->fn);
>  	int pos_cap_err, rp_pos_cap_err;
> -	u32 sever;
> +	u32 sever, mask;
>  	int ret = 0;
>  
>  	dev = pci_get_bus_and_slot(einj->bus, devfn);

This does not apply.  Please respin against latest linux-2.6 or pci-2.6.

> @@ -354,6 +354,22 @@ static int aer_inject(struct aer_error_inj *einj)
>  	err->header_log2 = einj->header_log2;
>  	err->header_log3 = einj->header_log3;
>  
> +	pci_read_config_dword(dev, pos_cap_err + PCI_ERR_COR_MASK, &mask);
> +	if (einj->cor_status && !(einj->cor_status & ~mask)) {
> +		ret = -EINVAL;
> +		printk(KERN_WARNING "The correctable error is masked by device\n");

You can inject multiple correctable errors with the aer-inject user-land
tool, so perhaps this should be re-worded as:

"The correctable error(s) are masked by the device\n"

> +		spin_unlock_irqrestore(&inject_lock, flags);
> +		goto out_put;
> +	}
> +
> +	pci_read_config_dword(dev, pos_cap_err + PCI_ERR_UNCOR_MASK, &mask);
> +	if (einj->uncor_status && !(einj->uncor_status & ~mask)) {
> +		ret = -EINVAL;
> +		printk(KERN_WARNING "The uncorrectable error is masked by device\n");

Same as above

> +		spin_unlock_irqrestore(&inject_lock, flags);
> +		goto out_put;
> +	}
> +

You can also simultaneously inject correctable and uncorrectable errors,
so I don't particularly like returning errors here.  Perhaps you should
just print the warning message out and just not inject the masked
errors.

>  	rperr = __find_aer_error_by_dev(rpdev);
>  	if (!rperr) {
>  		rperr = rperr_alloc;
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
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> 


-- 
Andrew Patterson
Hewlett-Packard

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