linux-kernel - Re: [PATCH 5/5] PCI-Express AER implemetation: pcie

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Date:	Wed, 26 Jul 2006 12:56:31 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Linas Vepstas <linas@...tin.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-pci maillist <linux-pci@...ey.karlin.mff.cuni.cz>,
	Greg KH <greg@...ah.com>,
	Tom Long Nguyen <tom.l.nguyen@...el.com>
Subject: Re: [PATCH 5/5] PCI-Express AER implemetation: pcie_portdrv error
	handler

On Tue, 2006-07-25 at 03:37, Linas Vepstas wrote:
> Hi,
> 
> Sorry for a late reply...
> 
> On Fri, Jul 14, 2006 at 01:35:38PM +0800, Zhang, Yanmin wrote:
> > 
> > --- linux-2.6.17/drivers/pci/pcie/portdrv_pci.c	2006-06-22 16:27:35.000000000 +0800
> > +++ linux-2.6.17_aer/drivers/pci/pcie/portdrv_pci.c	2006-06-22 16:46:29.000000000 +0800
> > +
> > +static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
> > +					enum pci_channel_state error)
> > +{
> > +	/* If fatal, save cfg space for possible link reset at upstream */
> > +	if (error == pci_channel_io_frozen)
> > +		pcie_portdrv_save_config(dev);
> 
> If the channel is frozen, is the config space still readable? 
> In my case, I had to save config space data early on before
> the bus error. 
You are right.

> 
> What's more, I discovered that I had to save the pci config 
> space data before device drivers do thier probe. During the probe, 
> device drivers will change the config. For example, they'll enable
> interrupts and dma. If you turn these on, and then do the probe,
> you'll get spectacuar failures.
> 
> To be safe, I found the best thing to do was to save the pci
> config space state as it was during boot, before the PCI probe 
> routines ran.
Thanks. I will try.

> 
> --linas
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